1321112142421 has 4 divisors (see below), whose sum is σ = 1325360091744. Its totient is φ = 1316864193100.

The previous prime is 1321112142407. The next prime is 1321112142463. The reversal of 1321112142421 is 1242412111231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321112142421 - 2²⁵ = 1321078587989 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 (1321112142481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123974195 + ... + 2123974816.

It is an arithmetic number, because the mean of its divisors is an integer number (331340022936).

Almost surely, 2^{1321112142421} is an apocalyptic number.

It is an amenable number.

1321112142421 is a deficient number, since it is larger than the sum of its proper divisors (4247949323).

1321112142421 is an equidigital number, since it uses as much as digits as its factorization.

1321112142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247949322.

The product of its digits is 768, while the sum is 25.

Adding to 1321112142421 its reverse (1242412111231), we get a palindrome (2563524253652).

The spelling of 1321112142421 in words is "one trillion, three hundred twenty-one billion, one hundred twelve million, one hundred forty-two thousand, four hundred twenty-one".