21083814455819 has 2 divisors, whose sum is σ = 21083814455820. Its totient is φ = 21083814455818.

The previous prime is 21083814455719. The next prime is 21083814455867. The reversal of 21083814455819 is 91855441838012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21083814455819 is a prime.

It is a super-2 number, since 2×21083814455819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21083814455219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541907227909 + 10541907227910.

It is an arithmetic number, because the mean of its divisors is an integer number (10541907227910).

Almost surely, 2^{21083814455819} is an apocalyptic number.

21083814455819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083814455819 is an equidigital number, since it uses as much as digits as its factorization.

21083814455819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11059200, while the sum is 59.

The spelling of 21083814455819 in words is "twenty-one trillion, eighty-three billion, eight hundred fourteen million, four hundred fifty-five thousand, eight hundred nineteen".