1351221425123 has 4 divisors (see below), whose sum is σ = 1351234807080. Its totient is φ = 1351208043168.

The previous prime is 1351221425111. The next prime is 1351221425129. The reversal of 1351221425123 is 3215241221531.

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

It is a cyclic number.

It is not a de Polignac number, because 1351221425123 - 2³⁴ = 1334041555939 is a prime.

It is a super-2 number, since 2×1351221425123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1351221425123.

It is not an unprimeable number, because it can be changed into a prime (1351221425129) 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, 6538358 + ... + 6741851.

It is an arithmetic number, because the mean of its divisors is an integer number (337808701770).

Almost surely, 2^{1351221425123} is an apocalyptic number.

1351221425123 is a deficient number, since it is larger than the sum of its proper divisors (13381957).

1351221425123 is a wasteful number, since it uses less digits than its factorization.

1351221425123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13381956.

The product of its digits is 14400, while the sum is 32.

Adding to 1351221425123 its reverse (3215241221531), we get a palindrome (4566462646654).

The spelling of 1351221425123 in words is "one trillion, three hundred fifty-one billion, two hundred twenty-one million, four hundred twenty-five thousand, one hundred twenty-three".