21629298520 has 64 divisors (see below), whose sum is σ = 51197508000. Its totient is φ = 8211775488.

The previous prime is 21629298503. The next prime is 21629298557. The reversal of 21629298520 is 2589292612.

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, 89577 + ... + 226456.

Almost surely, 2^21629298520 is an apocalyptic number.

21629298520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21629298520 is an abundant number, since it is smaller than the sum of its proper divisors (29568209480).

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

21629298520 is a wasteful number, since it uses less digits than its factorization.

21629298520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316132 (or 316128 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 21629298520 in words is "twenty-one billion, six hundred twenty-nine million, two hundred ninety-eight thousand, five hundred twenty".