19621884897 has 6 divisors (see below), whose sum is σ = 28342722642. Its totient is φ = 13081256592.

The previous prime is 19621884827. The next prime is 19621884917. The reversal of 19621884897 is 79848812691.

19621884897 is a `hidden beast` number, since 19 + 62 + 1 + 88 + 489 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16771286016 + 2850598881 = 129504^2 + 53391^2 .

It is not a de Polignac number, because 19621884897 - 2²² = 19617690593 is a prime.

It is a super-2 number, since 2×19621884897² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19621884827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1090104708 + ... + 1090104725.

It is an arithmetic number, because the mean of its divisors is an integer number (4723787107).

Almost surely, 2^19621884897 is an apocalyptic number.

It is an amenable number.

19621884897 is a deficient number, since it is larger than the sum of its proper divisors (8720837745).

19621884897 is a wasteful number, since it uses less digits than its factorization.

19621884897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180209439 (or 2180209436 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 63.

The spelling of 19621884897 in words is "nineteen billion, six hundred twenty-one million, eight hundred eighty-four thousand, eight hundred ninety-seven".