125100921 has 16 divisors (see below), whose sum is σ = 191543040. Its totient is φ = 71827920.

The previous prime is 125100907. The next prime is 125100929. The reversal of 125100921 is 129001521.

It is not a de Polignac number, because 125100921 - 2¹³ = 125092729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125100929) 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, 99135 + ... + 100388.

It is an arithmetic number, because the mean of its divisors is an integer number (11971440).

Almost surely, 2^125100921 is an apocalyptic number.

125100921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125100921 is a deficient number, since it is larger than the sum of its proper divisors (66442119).

125100921 is a wasteful number, since it uses less digits than its factorization.

125100921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199556.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 125100921 is about 11184.8523012152. The cubic root of 125100921 is about 500.1345251361.

The spelling of 125100921 in words is "one hundred twenty-five million, one hundred thousand, nine hundred twenty-one".