19221228571387 has 2 divisors, whose sum is σ = 19221228571388. Its totient is φ = 19221228571386.

The previous prime is 19221228571379. The next prime is 19221228571397. The reversal of 19221228571387 is 78317582212291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19221228571387 - 2³ = 19221228571379 is a prime.

It is not a weakly prime, because it can be changed into another prime (19221228571397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9610614285693 + 9610614285694.

It is an arithmetic number, because the mean of its divisors is an integer number (9610614285694).

Almost surely, 2^{19221228571387} is an apocalyptic number.

19221228571387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19221228571387 is an equidigital number, since it uses as much as digits as its factorization.

19221228571387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The spelling of 19221228571387 in words is "nineteen trillion, two hundred twenty-one billion, two hundred twenty-eight million, five hundred seventy-one thousand, three hundred eighty-seven".