21694700 has 18 divisors (see below), whose sum is σ = 47077716. Its totient is φ = 8677840.

The previous prime is 21694693. The next prime is 21694709. The reversal of 21694700 is 749612.

It is not an unprimeable number, because it can be changed into a prime (21694709) 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 5 ways as a sum of consecutive naturals, for example, 108374 + ... + 108573.

Almost surely, 2^21694700 is an apocalyptic number.

21694700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21694700 is an abundant number, since it is smaller than the sum of its proper divisors (25383016).

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

21694700 is a wasteful number, since it uses less digits than its factorization.

21694700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216961 (or 216954 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21694700 is about 4657.7569709035. The cubic root of 21694700 is about 278.9017352420.

The spelling of 21694700 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred".