21316722 has 32 divisors (see below), whose sum is σ = 50844672. Its totient is φ = 5825424.

The previous prime is 21316721. The next prime is 21316723. The reversal of 21316722 is 22761312.

It is an interprime number because it is at equal distance from previous prime (21316721) and next prime (21316723).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21316692 and 21316701.

It is not an unprimeable number, because it can be changed into a prime (21316721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10068 + ... + 11999.

It is an arithmetic number, because the mean of its divisors is an integer number (1588896).

Almost surely, 2^21316722 is an apocalyptic number.

21316722 is an abundant number, since it is smaller than the sum of its proper divisors (29527950).

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

21316722 is a wasteful number, since it uses less digits than its factorization.

21316722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22102.

The product of its digits is 1008, while the sum is 24.

The square root of 21316722 is about 4617.0035737478. The cubic root of 21316722 is about 277.2725057029.

The spelling of 21316722 in words is "twenty-one million, three hundred sixteen thousand, seven hundred twenty-two".