21150456 has 16 divisors (see below), whose sum is σ = 52876200. Its totient is φ = 7050144.

The previous prime is 21150443. The next prime is 21150487. The reversal of 21150456 is 65405112.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 881269 = 21150456 / (2 + 1 + 1 + 5 + 0 + 4 + 5 + 6).

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 440611 + ... + 440658.

Almost surely, 2^21150456 is an apocalyptic number.

It is an amenable number.

21150456 is an abundant number, since it is smaller than the sum of its proper divisors (31725744).

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

21150456 is a wasteful number, since it uses less digits than its factorization.

21150456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881278 (or 881274 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 21150456 is about 4598.9624916931. The cubic root of 21150456 is about 276.5497339762.

Adding to 21150456 its reverse (65405112), we get a palindrome (86555568).

The spelling of 21150456 in words is "twenty-one million, one hundred fifty thousand, four hundred fifty-six".