1321023021378 has 16 divisors (see below), whose sum is σ = 2653583364480. Its totient is φ = 438418120176.

The previous prime is 1321023021377. The next prime is 1321023021389. The reversal of 1321023021378 is 8731203201231.

It is not an unprimeable number, because it can be changed into a prime (1321023021377) 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, 480720250 + ... + 480722997.

It is an arithmetic number, because the mean of its divisors is an integer number (165848960280).

Almost surely, 2^{1321023021378} is an apocalyptic number.

1321023021378 is an abundant number, since it is smaller than the sum of its proper divisors (1332560343102).

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

1321023021378 is a wasteful number, since it uses less digits than its factorization.

1321023021378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961443481.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 1321023021378 in words is "one trillion, three hundred twenty-one billion, twenty-three million, twenty-one thousand, three hundred seventy-eight".