19812213872 has 20 divisors (see below), whose sum is σ = 41875816056. Its totient is φ = 9005551680.

The previous prime is 19812213871. The next prime is 19812213893. The reversal of 19812213872 is 27831221891.

It is a super-3 number, since 3×19812213872³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19812213871) 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, 56284523 + ... + 56284874.

Almost surely, 2^19812213872 is an apocalyptic number.

It is an amenable number.

19812213872 is an abundant number, since it is smaller than the sum of its proper divisors (22063602184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19812213872 is a wasteful number, since it uses less digits than its factorization.

19812213872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112569416 (or 112569410 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The spelling of 19812213872 in words is "nineteen billion, eight hundred twelve million, two hundred thirteen thousand, eight hundred seventy-two".