21368622 has 16 divisors (see below), whose sum is σ = 46622592. Its totient is φ = 6475320.

The previous prime is 21368617. The next prime is 21368629. The reversal of 21368622 is 22686312.

It is a self number, because there is not a number n which added to its sum of digits gives 21368622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368629) 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, 161818 + ... + 161949.

It is an arithmetic number, because the mean of its divisors is an integer number (2913912).

Almost surely, 2^21368622 is an apocalyptic number.

21368622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21368622 is an abundant number, since it is smaller than the sum of its proper divisors (25253970).

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

21368622 is a wasteful number, since it uses less digits than its factorization.

21368622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323783.

The product of its digits is 6912, while the sum is 30.

The square root of 21368622 is about 4622.6206852823. The cubic root of 21368622 is about 277.4973492158.

It can be divided in two parts, 2136862 and 2, that multiplied together give a palindrome (4273724).

The spelling of 21368622 in words is "twenty-one million, three hundred sixty-eight thousand, six hundred twenty-two".