125515141221 has 16 divisors (see below), whose sum is σ = 168937187328. Its totient is φ = 82885110000.

The previous prime is 125515141207. The next prime is 125515141249. The reversal of 125515141221 is 122141515521.

It is a de Polignac number, because none of the positive numbers 2^k-125515141221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125515141021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3690946 + ... + 3724796.

It is an arithmetic number, because the mean of its divisors is an integer number (10558574208).

Almost surely, 2^125515141221 is an apocalyptic number.

It is an amenable number.

125515141221 is a deficient number, since it is larger than the sum of its proper divisors (43422046107).

125515141221 is a wasteful number, since it uses less digits than its factorization.

125515141221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45512.

The product of its digits is 4000, while the sum is 30.

Adding to 125515141221 its reverse (122141515521), we get a palindrome (247656656742).

The spelling of 125515141221 in words is "one hundred twenty-five billion, five hundred fifteen million, one hundred forty-one thousand, two hundred twenty-one".