19572213109 has 4 divisors (see below), whose sum is σ = 19572592204. Its totient is φ = 19571834016.

The previous prime is 19572213097. The next prime is 19572213113. The reversal of 19572213109 is 90131227591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12474656100 + 7097557009 = 111690^2 + 84247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19572213109 is a prime.

It is a super-2 number, since 2×19572213109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19572213119) 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, 97062 + ... + 220375.

It is an arithmetic number, because the mean of its divisors is an integer number (4893148051).

Almost surely, 2^19572213109 is an apocalyptic number.

It is an amenable number.

19572213109 is a deficient number, since it is larger than the sum of its proper divisors (379095).

19572213109 is an equidigital number, since it uses as much as digits as its factorization.

19572213109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379094.

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 19572213109 in words is "nineteen billion, five hundred seventy-two million, two hundred thirteen thousand, one hundred nine".