1020401121399 has 48 divisors (see below), whose sum is σ = 1521358782720. Its totient is φ = 607898726160.

The previous prime is 1020401121359. The next prime is 1020401121413. The reversal of 1020401121399 is 9931211040201.

It is not a de Polignac number, because 1020401121399 - 2²¹ = 1020399024247 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020401121319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74545734 + ... + 74559420.

It is an arithmetic number, because the mean of its divisors is an integer number (31694974640).

Almost surely, 2^{1020401121399} is an apocalyptic number.

1020401121399 is a deficient number, since it is larger than the sum of its proper divisors (500957661321).

1020401121399 is an frugal number, since it uses more digits than its factorization.

1020401121399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13889 (or 13760 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The spelling of 1020401121399 in words is "one trillion, twenty billion, four hundred one million, one hundred twenty-one thousand, three hundred ninety-nine".