21251150 has 24 divisors (see below), whose sum is σ = 39648504. Its totient is φ = 8474400.

The previous prime is 21251141. The next prime is 21251179. The reversal of 21251150 is 5115212.

It is a super-2 number, since 2×21251150² = 903222752645000, which contains 22 as substring.

It is a Curzon number.

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, 31820 + ... + 32480.

It is an arithmetic number, because the mean of its divisors is an integer number (1652021).

Almost surely, 2^21251150 is an apocalyptic number.

21251150 is a deficient number, since it is larger than the sum of its proper divisors (18397354).

21251150 is a wasteful number, since it uses less digits than its factorization.

21251150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 21251150 is about 4609.8969619721. The cubic root of 21251150 is about 276.9879093021.

Adding to 21251150 its reverse (5115212), we get a palindrome (26366362).

The spelling of 21251150 in words is "twenty-one million, two hundred fifty-one thousand, one hundred fifty".