21120633970 has 16 divisors (see below), whose sum is σ = 38041368768. Its totient is φ = 8442869680.

The previous prime is 21120633923. The next prime is 21120633983. The reversal of 21120633970 is 7933602112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656494 + ... + 687913.

It is an arithmetic number, because the mean of its divisors is an integer number (2377585548).

Almost surely, 2^21120633970 is an apocalyptic number.

21120633970 is a deficient number, since it is larger than the sum of its proper divisors (16920734798).

21120633970 is a wasteful number, since it uses less digits than its factorization.

21120633970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345985.

The product of its (nonzero) digits is 13608, while the sum is 34.

The spelling of 21120633970 in words is "twenty-one billion, one hundred twenty million, six hundred thirty-three thousand, nine hundred seventy".