125612217211 has 4 divisors (see below), whose sum is σ = 135274695472. Its totient is φ = 115949738952.

The previous prime is 125612217169. The next prime is 125612217239. The reversal of 125612217211 is 112712216521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112712216521 = 149 ⋅756457829.

It is a cyclic number.

It is not a de Polignac number, because 125612217211 - 2³¹ = 123464733563 is a prime.

It is a super-2 number, since 2×125612217211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125612217281) 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, 4831239111 + ... + 4831239136.

It is an arithmetic number, because the mean of its divisors is an integer number (33818673868).

Almost surely, 2^125612217211 is an apocalyptic number.

125612217211 is a deficient number, since it is larger than the sum of its proper divisors (9662478261).

125612217211 is an equidigital number, since it uses as much as digits as its factorization.

125612217211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662478260.

The product of its digits is 3360, while the sum is 31.

The spelling of 125612217211 in words is "one hundred twenty-five billion, six hundred twelve million, two hundred seventeen thousand, two hundred eleven".