125142404221 has 4 divisors (see below), whose sum is σ = 125454480444. Its totient is φ = 124830328000.

The previous prime is 125142404197. The next prime is 125142404287. The reversal of 125142404221 is 122404241521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112435478596 + 12706925625 = 335314^2 + 112725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125142404221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125142404221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125142404021) 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, 156037510 + ... + 156038311.

It is an arithmetic number, because the mean of its divisors is an integer number (31363620111).

Almost surely, 2^125142404221 is an apocalyptic number.

It is an amenable number.

125142404221 is a deficient number, since it is larger than the sum of its proper divisors (312076223).

125142404221 is an equidigital number, since it uses as much as digits as its factorization.

125142404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312076222.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 125142404221 its reverse (122404241521), we get a palindrome (247546645742).

The spelling of 125142404221 in words is "one hundred twenty-five billion, one hundred forty-two million, four hundred four thousand, two hundred twenty-one".