21496866 has 32 divisors (see below), whose sum is σ = 45489600. Its totient is φ = 6753600.

The previous prime is 21496841. The next prime is 21496877. The reversal of 21496866 is 66869412.

It is a Curzon 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, 30316 + ... + 31016.

It is an arithmetic number, because the mean of its divisors is an integer number (1421550).

Almost surely, 2^21496866 is an apocalyptic number.

21496866 is an abundant number, since it is smaller than the sum of its proper divisors (23992734).

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

21496866 is a wasteful number, since it uses less digits than its factorization.

21496866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994.

The product of its digits is 124416, while the sum is 42.

The square root of 21496866 is about 4636.4712875203. The cubic root of 21496866 is about 278.0513767337.

The spelling of 21496866 in words is "twenty-one million, four hundred ninety-six thousand, eight hundred sixty-six".