21502122 has 16 divisors (see below), whose sum is σ = 44053632. Its totient is φ = 6992480.

The previous prime is 21502111. The next prime is 21502123. The reversal of 21502122 is 22120512.

It is not an unprimeable number, because it can be changed into a prime (21502123) 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, 43458 + ... + 43949.

It is an arithmetic number, because the mean of its divisors is an integer number (2753352).

Almost surely, 2^21502122 is an apocalyptic number.

21502122 is an abundant number, since it is smaller than the sum of its proper divisors (22551510).

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

21502122 is a wasteful number, since it uses less digits than its factorization.

21502122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87453.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21502122 is about 4637.0380632468. The cubic root of 21502122 is about 278.0740361444.

Adding to 21502122 its reverse (22120512), we get a palindrome (43622634).

The spelling of 21502122 in words is "twenty-one million, five hundred two thousand, one hundred twenty-two".