421770187919 has 2 divisors, whose sum is σ = 421770187920. Its totient is φ = 421770187918.

The previous prime is 421770187897. The next prime is 421770187921. The reversal of 421770187919 is 919781077124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421770187919 - 2²⁰ = 421769139343 is a prime.

It is a super-2 number, since 2×421770187919² (a number of 24 digits) contains 22 as substring.

Together with 421770187921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421770187999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210885093959 + 210885093960.

It is an arithmetic number, because the mean of its divisors is an integer number (210885093960).

Almost surely, 2^421770187919 is an apocalyptic number.

421770187919 is a deficient number, since it is larger than the sum of its proper divisors (1).

421770187919 is an equidigital number, since it uses as much as digits as its factorization.

421770187919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The spelling of 421770187919 in words is "four hundred twenty-one billion, seven hundred seventy million, one hundred eighty-seven thousand, nine hundred nineteen".