21027072012 has 12 divisors (see below), whose sum is σ = 49063168056. Its totient is φ = 7009024000.

The previous prime is 21027072007. The next prime is 21027072023.

21027072012 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876127989 + ... + 876128012.

It is an arithmetic number, because the mean of its divisors is an integer number (4088597338).

Almost surely, 2^21027072012 is an apocalyptic number.

It is an amenable number.

21027072012 is an abundant number, since it is smaller than the sum of its proper divisors (28036096044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21027072012 is a wasteful number, since it uses less digits than its factorization.

21027072012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752256008 (or 1752256006 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

It can be divided in two parts, 210270 and 72012, that added together give a palindrome (282282).

The spelling of 21027072012 in words is "twenty-one billion, twenty-seven million, seventy-two thousand, twelve".