19929909241 has 4 divisors (see below), whose sum is σ = 21741719184. Its totient is φ = 18118099300.

The previous prime is 19929909211. The next prime is 19929909283. The reversal of 19929909241 is 14290992991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19929909241 - 2³¹ = 17782425593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19929909211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905904955 + ... + 905904976.

It is an arithmetic number, because the mean of its divisors is an integer number (5435429796).

Almost surely, 2^19929909241 is an apocalyptic number.

19929909241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19929909241 is a deficient number, since it is larger than the sum of its proper divisors (1811809943).

19929909241 is a wasteful number, since it uses less digits than its factorization.

19929909241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811809942.

The product of its (nonzero) digits is 944784, while the sum is 55.

The spelling of 19929909241 in words is "nineteen billion, nine hundred twenty-nine million, nine hundred nine thousand, two hundred forty-one".