19909211925 has 24 divisors (see below), whose sum is σ = 32955258784. Its totient is φ = 10605764160.

The previous prime is 19909211911. The next prime is 19909211941. The reversal of 19909211925 is 52911290991.

It is not a de Polignac number, because 19909211925 - 2¹⁴ = 19909195541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91627 + ... + 219576.

Almost surely, 2^19909211925 is an apocalyptic number.

19909211925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19909211925 is a deficient number, since it is larger than the sum of its proper divisors (13046046859).

19909211925 is a wasteful number, since it uses less digits than its factorization.

19909211925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312069 (or 312064 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 48.

The spelling of 19909211925 in words is "nineteen billion, nine hundred nine million, two hundred eleven thousand, nine hundred twenty-five".