21853946 has 8 divisors (see below), whose sum is σ = 33838464. Its totient is φ = 10574460.

The previous prime is 21853927. The next prime is 21853961. The reversal of 21853946 is 64935812.

21853946 = 1344² + 1345² + ... + 1355².

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176180 + ... + 176303.

It is an arithmetic number, because the mean of its divisors is an integer number (4229808).

Almost surely, 2^21853946 is an apocalyptic number.

21853946 is a deficient number, since it is larger than the sum of its proper divisors (11984518).

21853946 is a wasteful number, since it uses less digits than its factorization.

21853946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352516.

The product of its digits is 51840, while the sum is 38.

The square root of 21853946 is about 4674.8204243586. The cubic root of 21853946 is about 279.5824814734.

The spelling of 21853946 in words is "twenty-one million, eight hundred fifty-three thousand, nine hundred forty-six".