22315706821 has 4 divisors (see below), whose sum is σ = 22693939200. Its totient is φ = 21937474444.

The previous prime is 22315706789. The next prime is 22315706837. The reversal of 22315706821 is 12860751322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12860751322 = 2 ⋅6430375661.

It is a cyclic number.

It is not a de Polignac number, because 22315706821 - 2⁵ = 22315706789 is a prime.

It is a super-3 number, since 3×22315706821³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22315716821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189116101 + ... + 189116218.

It is an arithmetic number, because the mean of its divisors is an integer number (5673484800).

Almost surely, 2^22315706821 is an apocalyptic number.

It is an amenable number.

22315706821 is a deficient number, since it is larger than the sum of its proper divisors (378232379).

22315706821 is an equidigital number, since it uses as much as digits as its factorization.

22315706821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378232378.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 22315706821 in words is "twenty-two billion, three hundred fifteen million, seven hundred six thousand, eight hundred twenty-one".