21870952 has 8 divisors (see below), whose sum is σ = 41008050. Its totient is φ = 10935472.

The previous prime is 21870931. The next prime is 21870967. The reversal of 21870952 is 25907812.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 3944196 = 4234^2 + 1986^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1366927 + ... + 1366942.

Almost surely, 2^21870952 is an apocalyptic number.

It is an amenable number.

21870952 is a deficient number, since it is larger than the sum of its proper divisors (19137098).

21870952 is a wasteful number, since it uses less digits than its factorization.

21870952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733875 (or 2733871 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 21870952 is about 4676.6389640424. The cubic root of 21870952 is about 279.6549832072.

It can be divided in two parts, 21870 and 952, that added together give a palindrome (22822).

The spelling of 21870952 in words is "twenty-one million, eight hundred seventy thousand, nine hundred fifty-two".