125755721421 has 8 divisors (see below), whose sum is σ = 182917413024. Its totient is φ = 76215588720.

The previous prime is 125755721419. The next prime is 125755721431. The reversal of 125755721421 is 124127557521.

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

It is not a de Polignac number, because 125755721421 - 2¹ = 125755721419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125755721431) 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 7 ways as a sum of consecutive naturals, for example, 1905389686 + ... + 1905389751.

It is an arithmetic number, because the mean of its divisors is an integer number (22864676628).

Almost surely, 2^125755721421 is an apocalyptic number.

125755721421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125755721421 is a deficient number, since it is larger than the sum of its proper divisors (57161691603).

125755721421 is a wasteful number, since it uses less digits than its factorization.

125755721421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810779451.

The product of its digits is 196000, while the sum is 42.

The spelling of 125755721421 in words is "one hundred twenty-five billion, seven hundred fifty-five million, seven hundred twenty-one thousand, four hundred twenty-one".