21072630042 has 24 divisors (see below), whose sum is σ = 45694928916. Its totient is φ = 7018430976.

The previous prime is 21072629993. The next prime is 21072630071. The reversal of 21072630042 is 24003627012.

21072630042 is a `hidden beast` number, since 21 + 0 + 7 + 2 + 630 + 0 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19157604921 + 1915025121 = 138411^2 + 43761^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21072629988 and 21072630015.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 459073 + ... + 502884.

Almost surely, 2^21072630042 is an apocalyptic number.

21072630042 is an abundant number, since it is smaller than the sum of its proper divisors (24622298874).

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

21072630042 is a wasteful number, since it uses less digits than its factorization.

21072630042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963182 (or 963179 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The spelling of 21072630042 in words is "twenty-one billion, seventy-two million, six hundred thirty thousand, forty-two".