145222412320521 has 8 divisors (see below), whose sum is σ = 215144314548960. Its totient is φ = 96814941546996.

The previous prime is 145222412320519. The next prime is 145222412320537. The reversal of 145222412320521 is 125023214222541.

145222412320521 is a `hidden beast` number, since 1 + 4 + 5 + 2 + 2 + 2 + 4 + 123 + 2 + 0 + 521 = 666.

It is not a de Polignac number, because 145222412320521 - 2¹ = 145222412320519 is a prime.

It is a super-2 number, since 2×145222412320521² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145222412320591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2689303931835 + ... + 2689303931888.

It is an arithmetic number, because the mean of its divisors is an integer number (26893039318620).

Almost surely, 2^{145222412320521} is an apocalyptic number.

It is an amenable number.

145222412320521 is a deficient number, since it is larger than the sum of its proper divisors (69921902228439).

145222412320521 is an equidigital number, since it uses as much as digits as its factorization.

145222412320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378607863732 (or 5378607863726 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 145222412320521 in words is "one hundred forty-five trillion, two hundred twenty-two billion, four hundred twelve million, three hundred twenty thousand, five hundred twenty-one".