21127112012 has 12 divisors (see below), whose sum is σ = 37104022536. Its totient is φ = 10525962720.

The previous prime is 21127111979. The next prime is 21127112021. The reversal of 21127112012 is 21021172112.

It is a happy number.

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, 9397058 + ... + 9399305.

It is an arithmetic number, because the mean of its divisors is an integer number (3092001878).

Almost surely, 2^21127112012 is an apocalyptic number.

It is an amenable number.

21127112012 is a deficient number, since it is larger than the sum of its proper divisors (15976910524).

21127112012 is a wasteful number, since it uses less digits than its factorization.

21127112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18796648 (or 18796646 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21127112012 its reverse (21021172112), we get a palindrome (42148284124).

The spelling of 21127112012 in words is "twenty-one billion, one hundred twenty-seven million, one hundred twelve thousand, twelve".