21150372 has 12 divisors (see below), whose sum is σ = 49350896. Its totient is φ = 7050120.

The previous prime is 21150331. The next prime is 21150377. The reversal of 21150372 is 27305112.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21150377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881254 + ... + 881277.

Almost surely, 2^21150372 is an apocalyptic number.

It is an amenable number.

21150372 is an abundant number, since it is smaller than the sum of its proper divisors (28200524).

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

21150372 is a wasteful number, since it uses less digits than its factorization.

21150372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762538 (or 1762536 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21150372 is about 4598.9533591895. The cubic root of 21150372 is about 276.5493678657.

Adding to 21150372 its reverse (27305112), we get a palindrome (48455484).

It can be divided in two parts, 211503 and 72, that added together give a triangular number (211575 = T₆₅₀).

The spelling of 21150372 in words is "twenty-one million, one hundred fifty thousand, three hundred seventy-two".