21134120012 has 12 divisors (see below), whose sum is σ = 36990708216. Its totient is φ = 10565346240.

The previous prime is 21134120003. The next prime is 21134120023. The reversal of 21134120012 is 21002143112.

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, 400493 + ... + 450180.

It is an arithmetic number, because the mean of its divisors is an integer number (3082559018).

Almost surely, 2^21134120012 is an apocalyptic number.

It is an amenable number.

21134120012 is a deficient number, since it is larger than the sum of its proper divisors (15856588204).

21134120012 is a wasteful number, since it uses less digits than its factorization.

21134120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856888 (or 856886 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21134120012 its reverse (21002143112), we get a palindrome (42136263124).

The spelling of 21134120012 in words is "twenty-one billion, one hundred thirty-four million, one hundred twenty thousand, twelve".