21677694 has 16 divisors (see below), whose sum is σ = 43740432. Its totient is φ = 7161728.

The previous prime is 21677687. The next prime is 21677699. The reversal of 21677694 is 49677612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15309 + ... + 16664.

It is an arithmetic number, because the mean of its divisors is an integer number (2733777).

Almost surely, 2^21677694 is an apocalyptic number.

21677694 is an abundant number, since it is smaller than the sum of its proper divisors (22062738).

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

21677694 is a wasteful number, since it uses less digits than its factorization.

21677694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32091.

The product of its digits is 127008, while the sum is 42.

The square root of 21677694 is about 4655.9310561906. The cubic root of 21677694 is about 278.8288412055.

The spelling of 21677694 in words is "twenty-one million, six hundred seventy-seven thousand, six hundred ninety-four".