1321002021021 has 16 divisors (see below), whose sum is σ = 1859290184640. Its totient is φ = 831953548800.

The previous prime is 1321002021011. The next prime is 1321002021047. The reversal of 1321002021021 is 1201202001231.

It is not a de Polignac number, because 1321002021021 - 2⁹ = 1321002020509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321002021011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32806330 + ... + 32846571.

It is an arithmetic number, because the mean of its divisors is an integer number (116205636540).

Almost surely, 2^{1321002021021} is an apocalyptic number.

It is an amenable number.

1321002021021 is a deficient number, since it is larger than the sum of its proper divisors (538288163619).

1321002021021 is a wasteful number, since it uses less digits than its factorization.

1321002021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65653276.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1321002021021 its reverse (1201202001231), we get a palindrome (2522204022252).

The spelling of 1321002021021 in words is "one trillion, three hundred twenty-one billion, two million, twenty-one thousand, twenty-one".