19621181352 has 16 divisors (see below), whose sum is σ = 49052953440. Its totient is φ = 6540393776.

The previous prime is 19621181341. The next prime is 19621181429. The reversal of 19621181352 is 25318112691.

It is a self number, because there is not a number n which added to its sum of digits gives 19621181352.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408774588 + ... + 408774635.

It is an arithmetic number, because the mean of its divisors is an integer number (3065809590).

Almost surely, 2^19621181352 is an apocalyptic number.

19621181352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19621181352 is an abundant number, since it is smaller than the sum of its proper divisors (29431772088).

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

19621181352 is a wasteful number, since it uses less digits than its factorization.

19621181352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817549232 (or 817549228 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The spelling of 19621181352 in words is "nineteen billion, six hundred twenty-one million, one hundred eighty-one thousand, three hundred fifty-two".