21522642 has 16 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 7166432.

The previous prime is 21522619. The next prime is 21522671. The reversal of 21522642 is 24622512.

It is a happy 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, 7798 + ... + 10190.

It is an arithmetic number, because the mean of its divisors is an integer number (2693250).

Almost surely, 2^21522642 is an apocalyptic number.

21522642 is an abundant number, since it is smaller than the sum of its proper divisors (21569358).

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

21522642 is a wasteful number, since it uses less digits than its factorization.

21522642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3897.

The product of its digits is 1920, while the sum is 24.

The square root of 21522642 is about 4639.2501549281. The cubic root of 21522642 is about 278.1624656342.

The spelling of 21522642 in words is "twenty-one million, five hundred twenty-two thousand, six hundred forty-two".