21696312 has 32 divisors (see below), whose sum is σ = 59172480. Its totient is φ = 6574560.

The previous prime is 21696307. The next prime is 21696313. The reversal of 21696312 is 21369612.

It is a self number, because there is not a number n which added to its sum of digits gives 21696312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21696313) 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, 40828 + ... + 41355.

It is an arithmetic number, because the mean of its divisors is an integer number (1849140).

Almost surely, 2^21696312 is an apocalyptic number.

21696312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21696312 is an abundant number, since it is smaller than the sum of its proper divisors (37476168).

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

21696312 is a wasteful number, since it uses less digits than its factorization.

21696312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82203 (or 82199 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 21696312 is about 4657.9300123553. The cubic root of 21696312 is about 278.9086428962.

The spelling of 21696312 in words is "twenty-one million, six hundred ninety-six thousand, three hundred twelve".