21151150 has 36 divisors (see below), whose sum is σ = 40825512. Its totient is φ = 8152480.

The previous prime is 21151147. The next prime is 21151159. The reversal of 21151150 is 5115112.

It is a super-2 number, since 2×21151150² = 894742292645000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151159) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41799 + ... + 42301.

It is an arithmetic number, because the mean of its divisors is an integer number (1134042).

Almost surely, 2^21151150 is an apocalyptic number.

21151150 is a deficient number, since it is larger than the sum of its proper divisors (19674362).

21151150 is a wasteful number, since it uses less digits than its factorization.

21151150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 21151150 is about 4599.0379428746. The cubic root of 21151150 is about 276.5527587087.

Adding to 21151150 its reverse (5115112), we get a palindrome (26266262).

The spelling of 21151150 in words is "twenty-one million, one hundred fifty-one thousand, one hundred fifty".