21266952 has 64 divisors (see below), whose sum is σ = 61115520. Its totient is φ = 6041088.

The previous prime is 21266951. The next prime is 21266953. The reversal of 21266952 is 25966212.

It is an interprime number because it is at equal distance from previous prime (21266951) and next prime (21266953).

It is not an unprimeable number, because it can be changed into a prime (21266951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46308 + ... + 46764.

It is an arithmetic number, because the mean of its divisors is an integer number (954930).

Almost surely, 2^21266952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21266952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30557760).

21266952 is an abundant number, since it is smaller than the sum of its proper divisors (39848568).

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

21266952 is a wasteful number, since it uses less digits than its factorization.

21266952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 746 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21266952 is about 4611.6105646509. The cubic root of 21266952 is about 277.0565468192.

The spelling of 21266952 in words is "twenty-one million, two hundred sixty-six thousand, nine hundred fifty-two".