21320022 has 16 divisors (see below), whose sum is σ = 43241472. Its totient is φ = 7006440.

The previous prime is 21320021. The next prime is 21320051. The reversal of 21320022 is 22002312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24598 + ... + 25449.

It is an arithmetic number, because the mean of its divisors is an integer number (2702592).

Almost surely, 2^21320022 is an apocalyptic number.

21320022 is an abundant number, since it is smaller than the sum of its proper divisors (21921450).

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

21320022 is a wasteful number, since it uses less digits than its factorization.

21320022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50123.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21320022 is about 4617.3609345599. The cubic root of 21320022 is about 277.2868129692.

Adding to 21320022 its reverse (22002312), we get a palindrome (43322334).

The spelling of 21320022 in words is "twenty-one million, three hundred twenty thousand, twenty-two".