21970590 has 32 divisors (see below), whose sum is σ = 53204256. Its totient is φ = 5806080.

The previous prime is 21970577. The next prime is 21970601. The reversal of 21970590 is 9507912.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (1662633).

Almost surely, 2^21970590 is an apocalyptic number.

21970590 is an abundant number, since it is smaller than the sum of its proper divisors (31233666).

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

21970590 is a wasteful number, since it uses less digits than its factorization.

21970590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 21970590 is about 4687.2795948183. The cubic root of 21970590 is about 280.0790168148.

The spelling of 21970590 in words is "twenty-one million, nine hundred seventy thousand, five hundred ninety".