21051952 has 10 divisors (see below), whose sum is σ = 40788188. Its totient is φ = 10525968.

The previous prime is 21051949. The next prime is 21051977. The reversal of 21051952 is 25915012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657858 + ... + 657889.

Almost surely, 2^21051952 is an apocalyptic number.

It is an amenable number.

21051952 is a deficient number, since it is larger than the sum of its proper divisors (19736236).

21051952 is a wasteful number, since it uses less digits than its factorization.

21051952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315755 (or 1315749 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 21051952 is about 4588.2406214147. The cubic root of 21051952 is about 276.1197408043.

Adding to 21051952 its reverse (25915012), we get a palindrome (46966964).

The spelling of 21051952 in words is "twenty-one million, fifty-one thousand, nine hundred fifty-two".