1321220133021 has 16 divisors (see below), whose sum is σ = 1818653188608. Its totient is φ = 852306489600.

The previous prime is 1321220133019. The next prime is 1321220133059. The reversal of 1321220133021 is 1203310221231.

It is not a de Polignac number, because 1321220133021 - 2¹ = 1321220133019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321220133061) 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 15 ways as a sum of consecutive naturals, for example, 76585 + ... + 1627361.

It is an arithmetic number, because the mean of its divisors is an integer number (113665824288).

Almost surely, 2^{1321220133021} is an apocalyptic number.

It is an amenable number.

1321220133021 is a deficient number, since it is larger than the sum of its proper divisors (497433055587).

1321220133021 is a wasteful number, since it uses less digits than its factorization.

1321220133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559972.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1321220133021 its reverse (1203310221231), we get a palindrome (2524530354252).

The spelling of 1321220133021 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, one hundred thirty-three thousand, twenty-one".