21121476858 has 12 divisors (see below), whose sum is σ = 45763199898. Its totient is φ = 7040492280.

The previous prime is 21121476809. The next prime is 21121476907. The reversal of 21121476858 is 85867412112.

21121476858 is a `hidden beast` number, since 2 + 1 + 121 + 476 + 8 + 58 = 666.

It is an interprime number because it is at equal distance from previous prime (21121476809) and next prime (21121476907).

It can be written as a sum of positive squares in only one way, i.e., 20281462569 + 840014289 = 142413^2 + 28983^2 .

It is a super-2 number, since 2×21121476858² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586707673 + ... + 586707708.

Almost surely, 2^21121476858 is an apocalyptic number.

21121476858 is an abundant number, since it is smaller than the sum of its proper divisors (24641723040).

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

21121476858 is a wasteful number, since it uses less digits than its factorization.

21121476858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173415389 (or 1173415386 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The spelling of 21121476858 in words is "twenty-one billion, one hundred twenty-one million, four hundred seventy-six thousand, eight hundred fifty-eight".