21689228352 has 56 divisors (see below), whose sum is σ = 62603006112. Its totient is φ = 6572492800.

The previous prime is 21689228347. The next prime is 21689228377. The reversal of 21689228352 is 25382298612.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 5132649 + ... + 5136872.

Almost surely, 2^21689228352 is an apocalyptic number.

21689228352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21689228352 is an abundant number, since it is smaller than the sum of its proper divisors (40913777760).

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

21689228352 is a wasteful number, since it uses less digits than its factorization.

21689228352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269547 (or 10269537 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The spelling of 21689228352 in words is "twenty-one billion, six hundred eighty-nine million, two hundred twenty-eight thousand, three hundred fifty-two".