19421959429 has 16 divisors (see below), whose sum is σ = 20656512000. Its totient is φ = 18209548224.

The previous prime is 19421959421. The next prime is 19421959457. The reversal of 19421959429 is 92495912491.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19421959429 - 2³ = 19421959421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19421959429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19421959421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 771804 + ... + 796570.

It is an arithmetic number, because the mean of its divisors is an integer number (1291032000).

Almost surely, 2^19421959429 is an apocalyptic number.

19421959429 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19421959429 is a deficient number, since it is larger than the sum of its proper divisors (1234552571).

19421959429 is a wasteful number, since it uses less digits than its factorization.

19421959429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25212.

The product of its digits is 2099520, while the sum is 55.

The spelling of 19421959429 in words is "nineteen billion, four hundred twenty-one million, nine hundred fifty-nine thousand, four hundred twenty-nine".