21953662 has 8 divisors (see below), whose sum is σ = 33056496. Its totient is φ = 10934832.

The previous prime is 21953641. The next prime is 21953677. The reversal of 21953662 is 26635912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20343 + ... + 21394.

It is an arithmetic number, because the mean of its divisors is an integer number (4132062).

Almost surely, 2^21953662 is an apocalyptic number.

21953662 is a deficient number, since it is larger than the sum of its proper divisors (11102834).

21953662 is a wasteful number, since it uses less digits than its factorization.

21953662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42002.

The product of its digits is 19440, while the sum is 34.

The square root of 21953662 is about 4685.4735086222. The cubic root of 21953662 is about 280.0070661482.

The spelling of 21953662 in words is "twenty-one million, nine hundred fifty-three thousand, six hundred sixty-two".