21053562 has 16 divisors (see below), whose sum is σ = 42208320. Its totient is φ = 7000992.

The previous prime is 21053537. The next prime is 21053563. The reversal of 21053562 is 26535012.

It is not an unprimeable number, because it can be changed into a prime (21053563) 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, 1363 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (2638020).

Almost surely, 2^21053562 is an apocalyptic number.

21053562 is an abundant number, since it is smaller than the sum of its proper divisors (21154758).

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

21053562 is a wasteful number, since it uses less digits than its factorization.

21053562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8437.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21053562 is about 4588.4160665746. The cubic root of 21053562 is about 276.1267796045.

Adding to 21053562 its reverse (26535012), we get a palindrome (47588574).

The spelling of 21053562 in words is "twenty-one million, fifty-three thousand, five hundred sixty-two".