21311150 has 24 divisors (see below), whose sum is σ = 45302160. Its totient is φ = 7306560.

The previous prime is 21311137. The next prime is 21311161. The reversal of 21311150 is 5111312.

It is a super-2 number, since 2×21311150² = 908330228645000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 11 ways as a sum of consecutive naturals, for example, 30095 + ... + 30794.

It is an arithmetic number, because the mean of its divisors is an integer number (1887590).

Almost surely, 2^21311150 is an apocalyptic number.

21311150 is an abundant number, since it is smaller than the sum of its proper divisors (23991010).

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

21311150 is a wasteful number, since it uses less digits than its factorization.

21311150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60908 (or 60903 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 21311150 is about 4616.4001126419. The cubic root of 21311150 is about 277.2483447487.

Adding to 21311150 its reverse (5111312), we get a palindrome (26422462).

The spelling of 21311150 in words is "twenty-one million, three hundred eleven thousand, one hundred fifty".