19421994471 has 48 divisors (see below), whose sum is σ = 30359865312. Its totient is φ = 10997155840.

The previous prime is 19421994457. The next prime is 19421994479. The reversal of 19421994471 is 17449912491.

It is not a de Polignac number, because 19421994471 - 2⁷ = 19421994343 is a prime.

It is a super-3 number, since 3×19421994471³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19421994479) 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 47 ways as a sum of consecutive naturals, for example, 833941 + ... + 856913.

It is an arithmetic number, because the mean of its divisors is an integer number (632497194).

Almost surely, 2^19421994471 is an apocalyptic number.

19421994471 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19421994471 is a deficient number, since it is larger than the sum of its proper divisors (10937870841).

19421994471 is a wasteful number, since it uses less digits than its factorization.

19421994471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23152 (or 23141 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The spelling of 19421994471 in words is "nineteen billion, four hundred twenty-one million, nine hundred ninety-four thousand, four hundred seventy-one".