21106952 has 8 divisors (see below), whose sum is σ = 39575550. Its totient is φ = 10553472.

The previous prime is 21106933. The next prime is 21106957. The reversal of 21106952 is 25960112.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 2116 = 4594^2 + 46^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319177 + ... + 1319192.

Almost surely, 2^21106952 is an apocalyptic number.

It is an amenable number.

21106952 is a deficient number, since it is larger than the sum of its proper divisors (18468598).

21106952 is a wasteful number, since it uses less digits than its factorization.

21106952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638375 (or 2638371 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 21106952 is about 4594.2302946195. The cubic root of 21106952 is about 276.3599937350.

The spelling of 21106952 in words is "twenty-one million, one hundred six thousand, nine hundred fifty-two".