21694402 has 8 divisors (see below), whose sum is σ = 32640912. Its totient is φ = 10814100.

The previous prime is 21694391. The next prime is 21694423. The reversal of 21694402 is 20449612.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 15724 + ... + 17047.

It is an arithmetic number, because the mean of its divisors is an integer number (4080114).

Almost surely, 2^21694402 is an apocalyptic number.

21694402 is a deficient number, since it is larger than the sum of its proper divisors (10946510).

21694402 is a wasteful number, since it uses less digits than its factorization.

21694402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33104.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21694402 is about 4657.7249811469. The cubic root of 21694402 is about 278.9004582312.

The spelling of 21694402 in words is "twenty-one million, six hundred ninety-four thousand, four hundred two".