1321002021402 has 24 divisors (see below), whose sum is σ = 3271052624736. Its totient is φ = 377429148936.

The previous prime is 1321002021343. The next prime is 1321002021407. The reversal of 1321002021402 is 2041202001231.

It is a happy number.

1321002021402 is a `hidden beast` number, since 1 + 321 + 0 + 0 + 202 + 140 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1321002021407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5242071388 + ... + 5242071639.

It is an arithmetic number, because the mean of its divisors is an integer number (136293859364).

Almost surely, 2^{1321002021402} is an apocalyptic number.

1321002021402 is an abundant number, since it is smaller than the sum of its proper divisors (1950050603334).

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

1321002021402 is a wasteful number, since it uses less digits than its factorization.

1321002021402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10484143042 (or 10484143039 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1321002021402 its reverse (2041202001231), we get a palindrome (3362204022633).

The spelling of 1321002021402 in words is "one trillion, three hundred twenty-one billion, two million, twenty-one thousand, four hundred two".