21514236 has 24 divisors (see below), whose sum is σ = 50951040. Its totient is φ = 7064112.

The previous prime is 21514211. The next prime is 21514247. The reversal of 21514236 is 63241512.

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 7 ways as a sum of consecutive naturals, for example, 12576 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (2122960).

Almost surely, 2^21514236 is an apocalyptic number.

It is an amenable number.

21514236 is an abundant number, since it is smaller than the sum of its proper divisors (29436804).

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

21514236 is a wasteful number, since it uses less digits than its factorization.

21514236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26833 (or 26831 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21514236 is about 4638.3441010775. The cubic root of 21514236 is about 278.1262473706.

Adding to 21514236 its reverse (63241512), we get a palindrome (84755748).

The spelling of 21514236 in words is "twenty-one million, five hundred fourteen thousand, two hundred thirty-six".