21522612 has 24 divisors (see below), whose sum is σ = 53174016. Its totient is φ = 6752128.

The previous prime is 21522607. The next prime is 21522617. The reversal of 21522612 is 21622512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21522607) and next prime (21522617).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522617) 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, 52548 + ... + 52955.

It is an arithmetic number, because the mean of its divisors is an integer number (2215584).

Almost surely, 2^21522612 is an apocalyptic number.

It is an amenable number.

21522612 is an abundant number, since it is smaller than the sum of its proper divisors (31651404).

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

21522612 is a wasteful number, since it uses less digits than its factorization.

21522612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105527 (or 105525 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 21522612 is about 4639.2469216458. The cubic root of 21522612 is about 278.1623363923.

The spelling of 21522612 in words is "twenty-one million, five hundred twenty-two thousand, six hundred twelve".