21497695352 has 32 divisors (see below), whose sum is σ = 46075068000. Its totient is φ = 9211582464.

The previous prime is 21497695337. The next prime is 21497695357. The reversal of 21497695352 is 25359679412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21497695294 and 21497695303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497695357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294728 + ... + 360360.

It is an arithmetic number, because the mean of its divisors is an integer number (1439845875).

Almost surely, 2^21497695352 is an apocalyptic number.

It is an amenable number.

21497695352 is an abundant number, since it is smaller than the sum of its proper divisors (24577372648).

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

21497695352 is a wasteful number, since it uses less digits than its factorization.

21497695352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71495 (or 71491 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 53.

The spelling of 21497695352 in words is "twenty-one billion, four hundred ninety-seven million, six hundred ninety-five thousand, three hundred fifty-two".