21856322 has 8 divisors (see below), whose sum is σ = 34713036. Its totient is φ = 10285312.

The previous prime is 21856277. The next prime is 21856337. The reversal of 21856322 is 22365812.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 502681 = 4621^2 + 709^2 .

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

It is a super-2 number, since 2×21856322² = 955397622735368, which contains 22 as substring.

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, 321383 + ... + 321450.

Almost surely, 2^21856322 is an apocalyptic number.

21856322 is a deficient number, since it is larger than the sum of its proper divisors (12856714).

21856322 is a wasteful number, since it uses less digits than its factorization.

21856322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642852.

The product of its digits is 5760, while the sum is 29.

The square root of 21856322 is about 4675.0745448602. The cubic root of 21856322 is about 279.5926133416.

The spelling of 21856322 in words is "twenty-one million, eight hundred fifty-six thousand, three hundred twenty-two".