125721206971 has 4 divisors (see below), whose sum is σ = 127235920392. Its totient is φ = 124206493552.

The previous prime is 125721206953. The next prime is 125721206981. The reversal of 125721206971 is 179602127521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125721206971 - 2¹⁵ = 125721174203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125721206981) 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, 757356586 + ... + 757356751.

It is an arithmetic number, because the mean of its divisors is an integer number (31808980098).

Almost surely, 2^125721206971 is an apocalyptic number.

125721206971 is a deficient number, since it is larger than the sum of its proper divisors (1514713421).

125721206971 is an equidigital number, since it uses as much as digits as its factorization.

125721206971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514713420.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 125721206971 in words is "one hundred twenty-five billion, seven hundred twenty-one million, two hundred six thousand, nine hundred seventy-one".