21694252 has 6 divisors (see below), whose sum is σ = 37964948. Its totient is φ = 10847124.

The previous prime is 21694249. The next prime is 21694271. The reversal of 21694252 is 25249612.

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 as a sum of consecutive naturals, namely, 2711778 + ... + 2711785.

Almost surely, 2^21694252 is an apocalyptic number.

It is an amenable number.

21694252 is a deficient number, since it is larger than the sum of its proper divisors (16270696).

21694252 is a wasteful number, since it uses less digits than its factorization.

21694252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423567 (or 5423565 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 21694252 is about 4657.7088788373. The cubic root of 21694252 is about 278.8998154361.

The spelling of 21694252 in words is "twenty-one million, six hundred ninety-four thousand, two hundred fifty-two".