19101971213 has 8 divisors (see below), whose sum is σ = 20641567128. Its totient is φ = 17572405824.

The previous prime is 19101971191. The next prime is 19101971303. The reversal of 19101971213 is 31217910191.

It can be written as a sum of positive squares in 4 ways, for example, as 127735204 + 18974236009 = 11302^2 + 137747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19101971213 - 2²⁰ = 19100922637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19101976213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2503670 + ... + 2511287.

It is an arithmetic number, because the mean of its divisors is an integer number (2580195891).

Almost surely, 2^19101971213 is an apocalyptic number.

19101971213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19101971213 is a deficient number, since it is larger than the sum of its proper divisors (1539595915).

19101971213 is a wasteful number, since it uses less digits than its factorization.

19101971213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015263.

The product of its (nonzero) digits is 3402, while the sum is 35.

The spelling of 19101971213 in words is "nineteen billion, one hundred one million, nine hundred seventy-one thousand, two hundred thirteen".