22521112120445 has 4 divisors (see below), whose sum is σ = 27025334544540. Its totient is φ = 18016889696352.

The previous prime is 22521112120387. The next prime is 22521112120453. The reversal of 22521112120445 is 54402121112522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3245377029049 + 19275735091396 = 1801493^2 + 4390414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22521112120445 - 2⁴⁴ = 4928926076029 is a prime.

It is a super-2 number, since 2×22521112120445² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252111212040 + ... + 2252111212049.

It is an arithmetic number, because the mean of its divisors is an integer number (6756333636135).

Almost surely, 2^{22521112120445} is an apocalyptic number.

It is an amenable number.

22521112120445 is a deficient number, since it is larger than the sum of its proper divisors (4504222424095).

22521112120445 is an equidigital number, since it uses as much as digits as its factorization.

22521112120445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504222424094.

The product of its (nonzero) digits is 12800, while the sum is 32.

Adding to 22521112120445 its reverse (54402121112522), we get a palindrome (76923233232967).

The spelling of 22521112120445 in words is "twenty-two trillion, five hundred twenty-one billion, one hundred twelve million, one hundred twenty thousand, four hundred forty-five".