125330021 has 4 divisors (see below), whose sum is σ = 125966412. Its totient is φ = 124693632.

The previous prime is 125330017. The next prime is 125330027. The reversal of 125330021 is 120033521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120033521 = 83 ⋅1446187.

It can be written as a sum of positive squares in 2 ways, for example, as 116856100 + 8473921 = 10810^2 + 2911^2 .

It is a cyclic number.

It is not a de Polignac number, because 125330021 - 2² = 125330017 is a prime.

It is a super-2 number, since 2×125330021² = 31415228327720882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125330027) 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, 317900 + ... + 318293.

It is an arithmetic number, because the mean of its divisors is an integer number (31491603).

Almost surely, 2^125330021 is an apocalyptic number.

It is an amenable number.

125330021 is a deficient number, since it is larger than the sum of its proper divisors (636391).

125330021 is an equidigital number, since it uses as much as digits as its factorization.

125330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636390.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 125330021 is about 11195.0891465857. The cubic root of 125330021 is about 500.4396413177.

Adding to 125330021 its reverse (120033521), we get a palindrome (245363542).

The spelling of 125330021 in words is "one hundred twenty-five million, three hundred thirty thousand, twenty-one".