21480220868 has 12 divisors (see below), whose sum is σ = 39801585852. Its totient is φ = 10108339200.

The previous prime is 21480220831. The next prime is 21480220877. The reversal of 21480220868 is 86802208412.

It can be written as a sum of positive squares in 2 ways, for example, as 9478580164 + 12001640704 = 97358^2 + 109552^2 .

It is a super-2 number, since 2×21480220868² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157942733 + ... + 157942868.

It is an arithmetic number, because the mean of its divisors is an integer number (3316798821).

Almost surely, 2^21480220868 is an apocalyptic number.

It is an amenable number.

21480220868 is a deficient number, since it is larger than the sum of its proper divisors (18321364984).

21480220868 is a wasteful number, since it uses less digits than its factorization.

21480220868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315885622 (or 315885620 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 21480220868 in words is "twenty-one billion, four hundred eighty million, two hundred twenty thousand, eight hundred sixty-eight".