1321528172912 has 20 divisors (see below), whose sum is σ = 2564334472536. Its totient is φ = 659764438080.

The previous prime is 1321528172911. The next prime is 1321528173037. The reversal of 1321528172912 is 2192718251231.

It is a super-3 number, since 3×1321528172912³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321528172911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62467118 + ... + 62488269.

Almost surely, 2^{1321528172912} is an apocalyptic number.

It is an amenable number.

1321528172912 is a deficient number, since it is larger than the sum of its proper divisors (1242806299624).

1321528172912 is a wasteful number, since it uses less digits than its factorization.

1321528172912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124956056 (or 124956050 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 1321528172912 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-eight million, one hundred seventy-two thousand, nine hundred twelve".