21053622 has 16 divisors (see below), whose sum is σ = 42344640. Its totient is φ = 6978312.

The previous prime is 21053609. The next prime is 21053639. The reversal of 21053622 is 22635012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8728 + ... + 10875.

It is an arithmetic number, because the mean of its divisors is an integer number (2646540).

Almost surely, 2^21053622 is an apocalyptic number.

21053622 is an abundant number, since it is smaller than the sum of its proper divisors (21291018).

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

21053622 is a wasteful number, since it uses less digits than its factorization.

21053622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19787.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21053622 is about 4588.4226047739. The cubic root of 21053622 is about 276.1270419131.

Adding to 21053622 its reverse (22635012), we get a palindrome (43688634).

The spelling of 21053622 in words is "twenty-one million, fifty-three thousand, six hundred twenty-two".