19621491117 has 8 divisors (see below), whose sum is σ = 26164844160. Its totient is φ = 13079566080.

The previous prime is 19621491091. The next prime is 19621491133. The reversal of 19621491117 is 71119412691.

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

It is not a de Polignac number, because 19621491117 - 2⁷ = 19621490989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621491217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324517 + ... + 380202.

It is an arithmetic number, because the mean of its divisors is an integer number (3270605520).

Almost surely, 2^19621491117 is an apocalyptic number.

It is an amenable number.

19621491117 is a deficient number, since it is larger than the sum of its proper divisors (6543353043).

19621491117 is an equidigital number, since it uses as much as digits as its factorization.

19621491117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714003.

The product of its digits is 27216, while the sum is 42.

The spelling of 19621491117 in words is "nineteen billion, six hundred twenty-one million, four hundred ninety-one thousand, one hundred seventeen".