21912702 has 48 divisors (see below), whose sum is σ = 51729552. Its totient is φ = 6168960.

The previous prime is 21912697. The next prime is 21912727. The reversal of 21912702 is 20721912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20952 + ... + 21972.

It is an arithmetic number, because the mean of its divisors is an integer number (1077699).

Almost surely, 2^21912702 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21912702, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25864776).

21912702 is an abundant number, since it is smaller than the sum of its proper divisors (29816850).

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

21912702 is a wasteful number, since it uses less digits than its factorization.

21912702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1106 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21912702 is about 4681.1005116319. The cubic root of 21912702 is about 279.8328168644.

It can be divided in two parts, 219 and 12702, that added together give a palindrome (12921).

The spelling of 21912702 in words is "twenty-one million, nine hundred twelve thousand, seven hundred two".