19221764837388 has 48 divisors (see below), whose sum is σ = 45894426014976. Its totient is φ = 6258167213760.

The previous prime is 19221764837381. The next prime is 19221764837389. The reversal of 19221764837388 is 88373846712291.

It is not an unprimeable number, because it can be changed into a prime (19221764837381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48856578 + ... + 49248438.

It is an arithmetic number, because the mean of its divisors is an integer number (956133875312).

Almost surely, 2^{19221764837388} is an apocalyptic number.

It is an amenable number.

19221764837388 is an abundant number, since it is smaller than the sum of its proper divisors (26672661177588).

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

19221764837388 is a wasteful number, since it uses less digits than its factorization.

19221764837388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486974 (or 486972 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 69.

The spelling of 19221764837388 in words is "nineteen trillion, two hundred twenty-one billion, seven hundred sixty-four million, eight hundred thirty-seven thousand, three hundred eighty-eight".