21257150 has 24 divisors (see below), whose sum is σ = 39700584. Its totient is φ = 8468000.

The previous prime is 21257141. The next prime is 21257177. The reversal of 21257150 is 5175212.

It is a happy number.

It is a super-2 number, since 2×21257150² = 903732852245000, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13925 + ... + 15375.

It is an arithmetic number, because the mean of its divisors is an integer number (1654191).

Almost surely, 2^21257150 is an apocalyptic number.

21257150 is a deficient number, since it is larger than the sum of its proper divisors (18443434).

21257150 is a wasteful number, since it uses less digits than its factorization.

21257150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 21257150 is about 4610.5476898087. The cubic root of 21257150 is about 277.0139748887.

The spelling of 21257150 in words is "twenty-one million, two hundred fifty-seven thousand, one hundred fifty".