21474137512 has 8 divisors (see below), whose sum is σ = 40264007850. Its totient is φ = 10737068752.

The previous prime is 21474137507. The next prime is 21474137539. The reversal of 21474137512 is 21573147412.

It can be written as a sum of positive squares in only one way, i.e., 20202073956 + 1272063556 = 142134^2 + 35666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21474137512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342133587 + ... + 1342133602.

Almost surely, 2^21474137512 is an apocalyptic number.

It is an amenable number.

21474137512 is a deficient number, since it is larger than the sum of its proper divisors (18789870338).

21474137512 is a wasteful number, since it uses less digits than its factorization.

21474137512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684267195 (or 2684267191 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The spelling of 21474137512 in words is "twenty-one billion, four hundred seventy-four million, one hundred thirty-seven thousand, five hundred twelve".