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2101021221 = 31353872339
BaseRepresentation
bin111110100111011…
…0000101000100101
312102102102221021210
41331032300220211
513300330134341
6544252102033
7103031246205
oct17516605045
95372387253
102101021221
11988a76382
124a7764919
13276387930
1415d074405
15c46b9c16
hex7d3b0a25

2101021221 has 8 divisors (see below), whose sum is σ = 3016851040. Its totient is φ = 1292936112.

The previous prime is 2101021217. The next prime is 2101021243. The reversal of 2101021221 is 1221201012.

2101021221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101021221 - 22 = 2101021217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101021197 and 2101021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101031221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26936131 + ... + 26936208.

It is an arithmetic number, because the mean of its divisors is an integer number (377106380).

Almost surely, 22101021221 is an apocalyptic number.

It is an amenable number.

2101021221 is a deficient number, since it is larger than the sum of its proper divisors (915829819).

2101021221 is a wasteful number, since it uses less digits than its factorization.

2101021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53872355.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2101021221 is about 45836.8980298624. The cubic root of 2101021221 is about 1280.7867114014.

Adding to 2101021221 its reverse (1221201012), we get a palindrome (3322222233).

The spelling of 2101021221 in words is "two billion, one hundred one million, twenty-one thousand, two hundred twenty-one".

Divisors: 1 3 13 39 53872339 161617017 700340407 2101021221