21118633870 has 32 divisors (see below), whose sum is σ = 39092852448. Its totient is φ = 8210587008.

The previous prime is 21118633867. The next prime is 21118633891. The reversal of 21118633870 is 7833681112.

It is a super-2 number, since 2×21118633870² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129489 + ... + 242908.

It is an arithmetic number, because the mean of its divisors is an integer number (1221651639).

Almost surely, 2^21118633870 is an apocalyptic number.

21118633870 is a deficient number, since it is larger than the sum of its proper divisors (17974218578).

21118633870 is a wasteful number, since it uses less digits than its factorization.

21118633870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372564.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21118633870 in words is "twenty-one billion, one hundred eighteen million, six hundred thirty-three thousand, eight hundred seventy".