125222021 has 8 divisors (see below), whose sum is σ = 126849600. Its totient is φ = 123599520.

The previous prime is 125222011. The next prime is 125222033. The reversal of 125222021 is 120222521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125222021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125222011) 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, 81026 + ... + 82556.

It is an arithmetic number, because the mean of its divisors is an integer number (15856200).

Almost surely, 2^125222021 is an apocalyptic number.

It is an amenable number.

125222021 is a deficient number, since it is larger than the sum of its proper divisors (1627579).

125222021 is an equidigital number, since it uses as much as digits as its factorization.

125222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 125222021 is about 11190.2645634498. The cubic root of 125222021 is about 500.2958529076.

Adding to 125222021 its reverse (120222521), we get a palindrome (245444542).

The spelling of 125222021 in words is "one hundred twenty-five million, two hundred twenty-two thousand, twenty-one".