21036372 has 24 divisors (see below), whose sum is σ = 56097216. Its totient is φ = 6010368.

The previous prime is 21036371. The next prime is 21036409. The reversal of 21036372 is 27363012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125133 + ... + 125300.

It is an arithmetic number, because the mean of its divisors is an integer number (2337384).

Almost surely, 2^21036372 is an apocalyptic number.

It is an amenable number.

21036372 is an abundant number, since it is smaller than the sum of its proper divisors (35060844).

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

21036372 is a wasteful number, since it uses less digits than its factorization.

21036372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250447 (or 250445 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21036372 is about 4586.5424886291. The cubic root of 21036372 is about 276.0516076569.

Adding to 21036372 its reverse (27363012), we get a palindrome (48399384).

The spelling of 21036372 in words is "twenty-one million, thirty-six thousand, three hundred seventy-two".