125486257021 has 4 divisors (see below), whose sum is σ = 128404542112. Its totient is φ = 122567971932.

The previous prime is 125486257009. The next prime is 125486257033. The reversal of 125486257021 is 120752684521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (125486257009) and next prime (125486257033).

It is a cyclic number.

It is not a de Polignac number, because 125486257021 - 2⁵ = 125486256989 is a prime.

It is a super-2 number, since 2×125486257021² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 2918285047 = 125486257021 / (1 + 2 + 5 + 4 + 8 + 6 + 2 + 5 + 7 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125486257081) 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, 1459142481 + ... + 1459142566.

It is an arithmetic number, because the mean of its divisors is an integer number (32101135528).

Almost surely, 2^125486257021 is an apocalyptic number.

It is an amenable number.

125486257021 is a deficient number, since it is larger than the sum of its proper divisors (2918285091).

125486257021 is an equidigital number, since it uses as much as digits as its factorization.

125486257021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918285090.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 125486257021 in words is "one hundred twenty-five billion, four hundred eighty-six million, two hundred fifty-seven thousand, twenty-one".