21352722 has 16 divisors (see below), whose sum is σ = 42756960. Its totient is φ = 7108992.

The previous prime is 21352703. The next prime is 21352733. The reversal of 21352722 is 22725312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21352692 and 21352701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5154 + ... + 8322.

It is an arithmetic number, because the mean of its divisors is an integer number (2672310).

Almost surely, 2^21352722 is an apocalyptic number.

21352722 is an abundant number, since it is smaller than the sum of its proper divisors (21404238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21352722 is a wasteful number, since it uses less digits than its factorization.

21352722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297.

The product of its digits is 1680, while the sum is 24.

The square root of 21352722 is about 4620.9005615789. The cubic root of 21352722 is about 277.4285052406.

The spelling of 21352722 in words is "twenty-one million, three hundred fifty-two thousand, seven hundred twenty-two".