1321023022400 has 84 divisors (see below), whose sum is σ = 3252794376288. Its totient is φ = 528043107840.

The previous prime is 1321023022357. The next prime is 1321023022471. The reversal of 1321023022400 is 42203201231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2029907 + ... + 2600493.

Almost surely, 2^{1321023022400} is an apocalyptic number.

1321023022400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321023022400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626397188144).

1321023022400 is an abundant number, since it is smaller than the sum of its proper divisors (1931771353888).

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

1321023022400 is a wasteful number, since it uses less digits than its factorization.

1321023022400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572056 (or 572041 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 1321023022400 its reverse (42203201231), we get a palindrome (1363226223631).

The spelling of 1321023022400 in words is "one trillion, three hundred twenty-one billion, twenty-three million, twenty-two thousand, four hundred".