125208021 has 8 divisors (see below), whose sum is σ = 174202560. Its totient is φ = 79842752.

The previous prime is 125208019. The next prime is 125208029. The reversal of 125208021 is 120802521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125208021 - 2¹ = 125208019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125208029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907236 + ... + 907373.

It is an arithmetic number, because the mean of its divisors is an integer number (21775320).

Almost surely, 2^125208021 is an apocalyptic number.

It is an amenable number.

125208021 is a deficient number, since it is larger than the sum of its proper divisors (48994539).

125208021 is a wasteful number, since it uses less digits than its factorization.

125208021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814635.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 125208021 is about 11189.6390022199. The cubic root of 125208021 is about 500.2772076168.

The spelling of 125208021 in words is "one hundred twenty-five million, two hundred eight thousand, twenty-one".