21922540 has 12 divisors (see below), whose sum is σ = 46037376. Its totient is φ = 8769008.

The previous prime is 21922531. The next prime is 21922559. The reversal of 21922540 is 4522912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548044 + ... + 548083.

It is an arithmetic number, because the mean of its divisors is an integer number (3836448).

Almost surely, 2^21922540 is an apocalyptic number.

21922540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21922540 is an abundant number, since it is smaller than the sum of its proper divisors (24114836).

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

21922540 is a wasteful number, since it uses less digits than its factorization.

21922540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096136 (or 1096134 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21922540 is about 4682.1512149865. The cubic root of 21922540 is about 279.8746888246.

The spelling of 21922540 in words is "twenty-one million, nine hundred twenty-two thousand, five hundred forty".