19969194021 has 48 divisors (see below), whose sum is σ = 31898455680. Its totient is φ = 10884424320.

The previous prime is 19969193989. The next prime is 19969194031. The reversal of 19969194021 is 12049196991.

It is a happy number.

It is not a de Polignac number, because 19969194021 - 2⁵ = 19969193989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969194031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4319091 + ... + 4323711.

It is an arithmetic number, because the mean of its divisors is an integer number (664551160).

Almost surely, 2^19969194021 is an apocalyptic number.

It is an amenable number.

19969194021 is a deficient number, since it is larger than the sum of its proper divisors (11929261659).

19969194021 is a wasteful number, since it uses less digits than its factorization.

19969194021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066 (or 5043 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 51.

The spelling of 19969194021 in words is "nineteen billion, nine hundred sixty-nine million, one hundred ninety-four thousand, twenty-one".