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2121002221 = 13212550309
BaseRepresentation
bin111111001101011…
…1110110011101101
312110211001002001211
41332122332303231
513320434032341
6550244234421
7103363135642
oct17632766355
95424032054
102121002221
119992833a8
124b239ba11
1327a562500
14161995dc9
15c6315181
hex7e6beced

2121002221 has 6 divisors (see below), whose sum is σ = 2296706730. Its totient is φ = 1957848048.

The previous prime is 2121002207. The next prime is 2121002249. The reversal of 2121002221 is 1222001212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 195021225 + 1925980996 = 13965^2 + 43886^2 .

It is not a de Polignac number, because 2121002221 - 217 = 2120871149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121002321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6274986 + ... + 6275323.

It is an arithmetic number, because the mean of its divisors is an integer number (382784455).

Almost surely, 22121002221 is an apocalyptic number.

It is an amenable number.

2121002221 is a deficient number, since it is larger than the sum of its proper divisors (175704509).

2121002221 is a wasteful number, since it uses less digits than its factorization.

2121002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12550335 (or 12550322 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2121002221 is about 46054.3398715040. The cubic root of 2121002221 is about 1284.8340605417.

Adding to 2121002221 its reverse (1222001212), we get a palindrome (3343003433).

The spelling of 2121002221 in words is "two billion, one hundred twenty-one million, two thousand, two hundred twenty-one".

Divisors: 1 13 169 12550309 163154017 2121002221