21236960931 has 8 divisors (see below), whose sum is σ = 28462663440. Its totient is φ = 14084616192.

The previous prime is 21236960923. The next prime is 21236960947. The reversal of 21236960931 is 13906963212.

It is a happy number.

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

It is not a de Polignac number, because 21236960931 - 2³ = 21236960923 is a prime.

It is a super-2 number, since 2×21236960931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21236960431) 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, 18338766 + ... + 18339923.

It is an arithmetic number, because the mean of its divisors is an integer number (3557832930).

Almost surely, 2^21236960931 is an apocalyptic number.

21236960931 is a deficient number, since it is larger than the sum of its proper divisors (7225702509).

21236960931 is a wasteful number, since it uses less digits than its factorization.

21236960931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36678885.

The product of its (nonzero) digits is 104976, while the sum is 42.

The spelling of 21236960931 in words is "twenty-one billion, two hundred thirty-six million, nine hundred sixty thousand, nine hundred thirty-one".