109619925921 has 81 divisors (see below), whose sum is σ = 177672899313. Its totient is φ = 65078853840.

The previous prime is 109619925911. The next prime is 109619925977. The reversal of 109619925921 is 129529916901.

The square root of 109619925921 is 331089.

It is a perfect power (a square), and thus also a powerful number.

109619925921 is a `hidden beast` number, since 10 + 9 + 619 + 9 + 2 + 5 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 109619925921 - 2⁹ = 109619925409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109619925911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 863148960 + ... + 863149086.

Almost surely, 2^109619925921 is an apocalyptic number.

109619925921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

109619925921 is the 331089-th square number.

109619925921 is the 165545-th centered octagonal number.

It is an amenable number.

109619925921 is a deficient number, since it is larger than the sum of its proper divisors (68052973392).

109619925921 is an equidigital number, since it uses as much as digits as its factorization.

109619925921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 54.

The spelling of 109619925921 in words is "one hundred nine billion, six hundred nineteen million, nine hundred twenty-five thousand, nine hundred twenty-one".