1251423222522 has 48 divisors (see below), whose sum is σ = 2755276624800. Its totient is φ = 378638281120.

The previous prime is 1251423222449. The next prime is 1251423222523. The reversal of 1251423222522 is 2252223241521.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1251423222523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845772 + ... + 1793927.

It is an arithmetic number, because the mean of its divisors is an integer number (57401596350).

Almost surely, 2^{1251423222522} is an apocalyptic number.

1251423222522 is an abundant number, since it is smaller than the sum of its proper divisors (1503853402278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251423222522 is a wasteful number, since it uses less digits than its factorization.

1251423222522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640379 (or 2640368 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The spelling of 1251423222522 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-three million, two hundred twenty-two thousand, five hundred twenty-two".