21693922 has 8 divisors (see below), whose sum is σ = 33955776. Its totient is φ = 10375332.

The previous prime is 21693911. The next prime is 21693937. The reversal of 21693922 is 22939612.

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, 235758 + ... + 235849.

It is an arithmetic number, because the mean of its divisors is an integer number (4244472).

Almost surely, 2^21693922 is an apocalyptic number.

21693922 is a deficient number, since it is larger than the sum of its proper divisors (12261854).

21693922 is a wasteful number, since it uses less digits than its factorization.

21693922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471632.

The product of its digits is 11664, while the sum is 34.

The square root of 21693922 is about 4657.6734535603. The cubic root of 21693922 is about 278.8984012765.

The spelling of 21693922 in words is "twenty-one million, six hundred ninety-three thousand, nine hundred twenty-two".