22501312021 has 16 divisors (see below), whose sum is σ = 23088684528. Its totient is φ = 21920371200.

The previous prime is 22501312007. The next prime is 22501312073. The reversal of 22501312021 is 12021310522.

It can be written as a sum of positive squares in 8 ways, for example, as 1429596100 + 21071715921 = 37810^2 + 145161^2 .

It is a cyclic number.

It is not a de Polignac number, because 22501312021 - 2⁷ = 22501311893 is a prime.

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 22501312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501312721) 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, 7874425 + ... + 7877281.

It is an arithmetic number, because the mean of its divisors is an integer number (1443042783).

Almost surely, 2^22501312021 is an apocalyptic number.

It is an amenable number.

22501312021 is a deficient number, since it is larger than the sum of its proper divisors (587372507).

22501312021 is a wasteful number, since it uses less digits than its factorization.

22501312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 22501312021 its reverse (12021310522), we get a palindrome (34522622543).

The spelling of 22501312021 in words is "twenty-two billion, five hundred one million, three hundred twelve thousand, twenty-one".