21304676237 has 12 divisors (see below), whose sum is σ = 23075763444. Its totient is φ = 19660567680.

The previous prime is 21304676227. The next prime is 21304676287. The reversal of 21304676237 is 73267640312.

It can be written as a sum of positive squares in 6 ways, for example, as 2418770761 + 18885905476 = 49181^2 + 137426^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21304676237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304676194 and 21304676203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304676227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 703937 + ... + 733577.

It is an arithmetic number, because the mean of its divisors is an integer number (1922980287).

Almost surely, 2^21304676237 is an apocalyptic number.

It is an amenable number.

21304676237 is a deficient number, since it is larger than the sum of its proper divisors (1771087207).

21304676237 is a wasteful number, since it uses less digits than its factorization.

21304676237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33920 (or 33907 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 21304676237 in words is "twenty-one billion, three hundred four million, six hundred seventy-six thousand, two hundred thirty-seven".