21694750 has 128 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 6468000.

The previous prime is 21694741. The next prime is 21694759. The reversal of 21694750 is 5749612.

It is an interprime number because it is at equal distance from previous prime (21694741) and next prime (21694759).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 943239 + ... + 943261.

It is an arithmetic number, because the mean of its divisors is an integer number (421200).

Almost surely, 2^21694750 is an apocalyptic number.

21694750 is an abundant number, since it is smaller than the sum of its proper divisors (32218850).

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

21694750 is a wasteful number, since it uses less digits than its factorization.

21694750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21694750 is about 4657.7623382908. The cubic root of 21694750 is about 278.9019495044.

The spelling of 21694750 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred fifty".