21072694 has 16 divisors (see below), whose sum is σ = 32743440. Its totient is φ = 10164960.

The previous prime is 21072683. The next prime is 21072703. The reversal of 21072694 is 49627012.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4837 + ... + 8095.

It is an arithmetic number, because the mean of its divisors is an integer number (2046465).

Almost surely, 2^21072694 is an apocalyptic number.

21072694 is a deficient number, since it is larger than the sum of its proper divisors (11670746).

21072694 is a wasteful number, since it uses less digits than its factorization.

21072694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21072694 is about 4590.5004084522. The cubic root of 21072694 is about 276.2103958294.

The spelling of 21072694 in words is "twenty-one million, seventy-two thousand, six hundred ninety-four".