125721206972 has 24 divisors (see below), whose sum is σ = 232965694080. Its totient is φ = 59159951360.

The previous prime is 125721206953. The next prime is 125721206981. The reversal of 125721206972 is 279602127521.

It is a super-2 number, since 2×125721206972² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937429 + ... + 2001267.

It is an arithmetic number, because the mean of its divisors is an integer number (9706903920).

Almost surely, 2^125721206972 is an apocalyptic number.

It is an amenable number.

125721206972 is a deficient number, since it is larger than the sum of its proper divisors (107244487108).

125721206972 is a wasteful number, since it uses less digits than its factorization.

125721206972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92821 (or 92819 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 125721206972 in words is "one hundred twenty-five billion, seven hundred twenty-one million, two hundred six thousand, nine hundred seventy-two".