18211219967 has 2 divisors, whose sum is σ = 18211219968. Its totient is φ = 18211219966.

The previous prime is 18211219903. The next prime is 18211220021. The reversal of 18211219967 is 76991211281.

It is a strong prime.

It is an emirp because it is prime and its reverse (76991211281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18211219967 - 2⁶ = 18211219903 is a prime.

It is a super-3 number, since 3×18211219967³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18261219967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9105609983 + 9105609984.

It is an arithmetic number, because the mean of its divisors is an integer number (9105609984).

Almost surely, 2^18211219967 is an apocalyptic number.

18211219967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18211219967 is an equidigital number, since it uses as much as digits as its factorization.

18211219967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 47.

The spelling of 18211219967 in words is "eighteen billion, two hundred eleven million, two hundred nineteen thousand, nine hundred sixty-seven".