21622940 has 24 divisors (see below), whose sum is σ = 46267200. Its totient is φ = 8485568.

The previous prime is 21622927. The next prime is 21622957. The reversal of 21622940 is 4922612.

21622940 = T₄₄₀ + T₄₄₁ + ... + T₅₉₈.

It is a congruent 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, 9140 + ... + 11259.

It is an arithmetic number, because the mean of its divisors is an integer number (1927800).

Almost surely, 2^21622940 is an apocalyptic number.

21622940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21622940 is an abundant number, since it is smaller than the sum of its proper divisors (24644260).

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

21622940 is a wasteful number, since it uses less digits than its factorization.

21622940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20461 (or 20459 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21622940 is about 4650.0473115873. The cubic root of 21622940 is about 278.5938859200.

The spelling of 21622940 in words is "twenty-one million, six hundred twenty-two thousand, nine hundred forty".