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202120021 = 1723516931
BaseRepresentation
bin11000000110000…
…01101101010101
3112002022202112201
430003001231111
5403220320041
632020044501
75002664125
oct1403015525
9462282481
10202120021
11a4100844
1257833731
1332b4a25c
141cbb4c85
1512b27631
hexc0c1b55

202120021 has 8 divisors (see below), whose sum is σ = 223314624. Its totient is φ = 181959360.

The previous prime is 202119989. The next prime is 202120091. The reversal of 202120021 is 120021202.

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

It is a cyclic number.

It is not a de Polignac number, because 202120021 - 25 = 202119989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120091) 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, 258075 + ... + 258856.

It is an arithmetic number, because the mean of its divisors is an integer number (27914328).

Almost surely, 2202120021 is an apocalyptic number.

It is an amenable number.

202120021 is a deficient number, since it is larger than the sum of its proper divisors (21194603).

202120021 is a wasteful number, since it uses less digits than its factorization.

202120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516971.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 202120021 is about 14216.8921005964. The cubic root of 202120021 is about 586.8626155812.

Adding to 202120021 its reverse (120021202), we get a palindrome (322141223).

It can be divided in two parts, 202 and 120021, that multiplied together give a palindrome (24244242).

The spelling of 202120021 in words is "two hundred two million, one hundred twenty thousand, twenty-one".

Divisors: 1 17 23 391 516931 8787827 11889413 202120021