21935966 has 16 divisors (see below), whose sum is σ = 36018528. Its totient is φ = 9957600.

The previous prime is 21935939. The next prime is 21935983. The reversal of 21935966 is 66953912.

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, 5330 + ... + 8501.

It is an arithmetic number, because the mean of its divisors is an integer number (2251158).

Almost surely, 2^21935966 is an apocalyptic number.

21935966 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21935966 is a deficient number, since it is larger than the sum of its proper divisors (14082562).

21935966 is a wasteful number, since it uses less digits than its factorization.

21935966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13907.

The product of its digits is 87480, while the sum is 41.

The square root of 21935966 is about 4683.5847382107. The cubic root of 21935966 is about 279.9318116267.

The spelling of 21935966 in words is "twenty-one million, nine hundred thirty-five thousand, nine hundred sixty-six".