1321224400121 has 4 divisors (see below), whose sum is σ = 1321231590144. Its totient is φ = 1321217210100.

The previous prime is 1321224400081. The next prime is 1321224400147. The reversal of 1321224400121 is 1210044221231.

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 a de Polignac number, because none of the positive numbers 2^k-1321224400121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321224400721) 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, 3311945 + ... + 3689366.

It is an arithmetic number, because the mean of its divisors is an integer number (330307897536).

Almost surely, 2^{1321224400121} is an apocalyptic number.

It is an amenable number.

1321224400121 is a deficient number, since it is larger than the sum of its proper divisors (7190023).

1321224400121 is an equidigital number, since it uses as much as digits as its factorization.

1321224400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7190022.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1321224400121 its reverse (1210044221231), we get a palindrome (2531268621352).

The spelling of 1321224400121 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-four million, four hundred thousand, one hundred twenty-one".