125442034121 has 4 divisors (see below), whose sum is σ = 125443176852. Its totient is φ = 125440891392.

The previous prime is 125442034051. The next prime is 125442034141. The reversal of 125442034121 is 121430244521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121430244521 = 41 ⋅2961713281.

It can be written as a sum of positive squares in 2 ways, for example, as 60743024521 + 64699009600 = 246461^2 + 254360^2 .

It is a cyclic number.

It is not a de Polignac number, because 125442034121 - 2¹⁴ = 125442017737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125442034141) 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, 386840 + ... + 632873.

It is an arithmetic number, because the mean of its divisors is an integer number (31360794213).

Almost surely, 2^125442034121 is an apocalyptic number.

It is an amenable number.

125442034121 is a deficient number, since it is larger than the sum of its proper divisors (1142731).

125442034121 is a wasteful number, since it uses less digits than its factorization.

125442034121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142730.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 125442034121 its reverse (121430244521), we get a palindrome (246872278642).

The spelling of 125442034121 in words is "one hundred twenty-five billion, four hundred forty-two million, thirty-four thousand, one hundred twenty-one".