125225012121 has 16 divisors (see below), whose sum is σ = 182252887488. Its totient is φ = 75849190400.

The previous prime is 125225012093. The next prime is 125225012123. The reversal of 125225012121 is 121210522521.

It is a cyclic number.

It is not a de Polignac number, because 125225012121 - 2⁷ = 125225011993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125225012091 and 125225012100.

It is not an unprimeable number, because it can be changed into a prime (125225012123) 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, 1062060 + ... + 1174061.

It is an arithmetic number, because the mean of its divisors is an integer number (11390805468).

Almost surely, 2^125225012121 is an apocalyptic number.

125225012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125225012121 is a deficient number, since it is larger than the sum of its proper divisors (57027875367).

125225012121 is a wasteful number, since it uses less digits than its factorization.

125225012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237832.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 125225012121 its reverse (121210522521), we get a palindrome (246435534642).

Subtracting from 125225012121 its reverse (121210522521), we obtain a square (4014489600 = 63360²).

The spelling of 125225012121 in words is "one hundred twenty-five billion, two hundred twenty-five million, twelve thousand, one hundred twenty-one".