125553421 has 16 divisors (see below), whose sum is σ = 147312000. Its totient is φ = 104767488.

The previous prime is 125553409. The next prime is 125553431. The reversal of 125553421 is 124355521.

It is a de Polignac number, because none of the positive numbers 2^k-125553421 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 125553421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125553401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134685 + ... + 135613.

It is an arithmetic number, because the mean of its divisors is an integer number (9207000).

Almost surely, 2^125553421 is an apocalyptic number.

It is an amenable number.

125553421 is a deficient number, since it is larger than the sum of its proper divisors (21758579).

125553421 is an equidigital number, since it uses as much as digits as its factorization.

125553421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its digits is 6000, while the sum is 28.

The square root of 125553421 is about 11205.0622934458. The cubic root of 125553421 is about 500.7368083602.

The spelling of 125553421 in words is "one hundred twenty-five million, five hundred fifty-three thousand, four hundred twenty-one".