19921441331 has 6 divisors (see below), whose sum is σ = 21897121596. Its totient is φ = 18110401100.

The previous prime is 19921441327. The next prime is 19921441367. The reversal of 19921441331 is 13314412991.

It is not a de Polignac number, because 19921441331 - 2² = 19921441327 is a prime.

It is a super-2 number, since 2×19921441331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19921441031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82319885 + ... + 82320126.

It is an arithmetic number, because the mean of its divisors is an integer number (3649520266).

Almost surely, 2^19921441331 is an apocalyptic number.

19921441331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19921441331 is a deficient number, since it is larger than the sum of its proper divisors (1975680265).

19921441331 is a wasteful number, since it uses less digits than its factorization.

19921441331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164640033 (or 164640022 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The spelling of 19921441331 in words is "nineteen billion, nine hundred twenty-one million, four hundred forty-one thousand, three hundred thirty-one".