21059495012 has 24 divisors (see below), whose sum is σ = 37346772960. Its totient is φ = 10389646080.

The previous prime is 21059495011. The next prime is 21059495021.

21059495012 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21059495011) 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, 46439 + ... + 210417.

It is an arithmetic number, because the mean of its divisors is an integer number (1556115540).

Almost surely, 2^21059495012 is an apocalyptic number.

It is an amenable number.

21059495012 is a deficient number, since it is larger than the sum of its proper divisors (16287277948).

21059495012 is a wasteful number, since it uses less digits than its factorization.

21059495012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164411 (or 164409 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 21059495012 in words is "twenty-one billion, fifty-nine million, four hundred ninety-five thousand, twelve".