21051592 has 8 divisors (see below), whose sum is σ = 39471750. Its totient is φ = 10525792.

The previous prime is 21051529. The next prime is 21051599. The reversal of 21051592 is 29515012.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 2268036 = 4334^2 + 1506^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21051599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315717 + ... + 1315732.

Almost surely, 2^21051592 is an apocalyptic number.

It is an amenable number.

21051592 is a deficient number, since it is larger than the sum of its proper divisors (18420158).

21051592 is a wasteful number, since it uses less digits than its factorization.

21051592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631455 (or 2631451 counting only the distinct ones).

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

The square root of 21051592 is about 4588.2013905233. The cubic root of 21051592 is about 276.1181668620.

The spelling of 21051592 in words is "twenty-one million, fifty-one thousand, five hundred ninety-two".