21722296 has 8 divisors (see below), whose sum is σ = 40729320. Its totient is φ = 10861144.

The previous prime is 21722291. The next prime is 21722297. The reversal of 21722296 is 69222712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1357636 + ... + 1357651.

It is an arithmetic number, because the mean of its divisors is an integer number (5091165).

Almost surely, 2^21722296 is an apocalyptic number.

It is an amenable number.

21722296 is a deficient number, since it is larger than the sum of its proper divisors (19007024).

21722296 is a wasteful number, since it uses less digits than its factorization.

21722296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715293 (or 2715289 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 21722296 is about 4660.7183995603. The cubic root of 21722296 is about 279.0199409359.

The spelling of 21722296 in words is "twenty-one million, seven hundred twenty-two thousand, two hundred ninety-six".