19621436971 has 6 divisors (see below), whose sum is σ = 20708497572. Its totient is φ = 18588729420.

The previous prime is 19621436969. The next prime is 19621436987. The reversal of 19621436971 is 17963412691.

It is not a de Polignac number, because 19621436971 - 2¹ = 19621436969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19621436371) 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 5 ways as a sum of consecutive naturals, for example, 27176145 + ... + 27176866.

It is an arithmetic number, because the mean of its divisors is an integer number (3451416262).

Almost surely, 2^19621436971 is an apocalyptic number.

19621436971 is a deficient number, since it is larger than the sum of its proper divisors (1087060601).

19621436971 is an equidigital number, since it uses as much as digits as its factorization.

19621436971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54353049 (or 54353030 counting only the distinct ones).

The product of its digits is 489888, while the sum is 49.

The spelling of 19621436971 in words is "nineteen billion, six hundred twenty-one million, four hundred thirty-six thousand, nine hundred seventy-one".