22407879821 has 8 divisors (see below), whose sum is σ = 22613072664. Its totient is φ = 22203581760.

The previous prime is 22407879797. The next prime is 22407879827. The reversal of 22407879821 is 12897870422.

It can be written as a sum of positive squares in 4 ways, for example, as 4927338025 + 17480541796 = 70195^2 + 132214^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22407879821 - 2⁶ = 22407879757 is a prime.

It is a super-2 number, since 2×22407879821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22407879821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22407879827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173330 + ... + 273603.

It is an arithmetic number, because the mean of its divisors is an integer number (2826634083).

Almost surely, 2^22407879821 is an apocalyptic number.

It is an amenable number.

22407879821 is a deficient number, since it is larger than the sum of its proper divisors (205192843).

22407879821 is a wasteful number, since it uses less digits than its factorization.

22407879821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447391.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 22407879821 in words is "twenty-two billion, four hundred seven million, eight hundred seventy-nine thousand, eight hundred twenty-one".