1331421104021 has 4 divisors (see below), whose sum is σ = 1331484079500. Its totient is φ = 1331358128544.

The previous prime is 1331421104009. The next prime is 1331421104029. The reversal of 1331421104021 is 1204011241331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154261203121 + 1177159900900 = 392761^2 + 1084970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331421104021 - 2²² = 1331416909717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331421104029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31456016 + ... + 31498313.

It is an arithmetic number, because the mean of its divisors is an integer number (332871019875).

Almost surely, 2^{1331421104021} is an apocalyptic number.

It is an amenable number.

1331421104021 is a deficient number, since it is larger than the sum of its proper divisors (62975479).

1331421104021 is an equidigital number, since it uses as much as digits as its factorization.

1331421104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62975478.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1331421104021 its reverse (1204011241331), we get a palindrome (2535432345352).

The spelling of 1331421104021 in words is "one trillion, three hundred thirty-one billion, four hundred twenty-one million, one hundred four thousand, twenty-one".