21492391562819 has 2 divisors, whose sum is σ = 21492391562820. Its totient is φ = 21492391562818.

The previous prime is 21492391562801. The next prime is 21492391562881. The reversal of 21492391562819 is 91826519329412.

It is an a-pointer prime, because the next prime (21492391562881) can be obtained adding 21492391562819 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21492391562819 - 2⁸ = 21492391562563 is a prime.

It is a super-2 number, since 2×21492391562819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21492391562119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746195781409 + 10746195781410.

It is an arithmetic number, because the mean of its divisors is an integer number (10746195781410).

Almost surely, 2^{21492391562819} is an apocalyptic number.

21492391562819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492391562819 is an equidigital number, since it uses as much as digits as its factorization.

21492391562819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 62.

The spelling of 21492391562819 in words is "twenty-one trillion, four hundred ninety-two billion, three hundred ninety-one million, five hundred sixty-two thousand, eight hundred nineteen".