21970652 has 24 divisors (see below), whose sum is σ = 42094080. Its totient is φ = 9950960.

The previous prime is 21970609. The next prime is 21970691. The reversal of 21970652 is 25607912.

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, 14549 + ... + 15987.

It is an arithmetic number, because the mean of its divisors is an integer number (1753920).

Almost surely, 2^21970652 is an apocalyptic number.

21970652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21970652 is a deficient number, since it is larger than the sum of its proper divisors (20123428).

21970652 is a wasteful number, since it uses less digits than its factorization.

21970652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 21970652 is about 4687.2862084579. The cubic root of 21970652 is about 280.0792802713.

It can be divided in two parts, 2197065 and 2, that multiplied together give a triangular number (4394130 = T₂₉₆₄).

The spelling of 21970652 in words is "twenty-one million, nine hundred seventy thousand, six hundred fifty-two".