102222121891 has 2 divisors, whose sum is σ = 102222121892. Its totient is φ = 102222121890.

The previous prime is 102222121889. The next prime is 102222122027. The reversal of 102222121891 is 198121222201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102222121891 - 2¹ = 102222121889 is a prime.

It is a super-2 number, since 2×102222121891² (a number of 23 digits) contains 22 as substring.

Together with 102222121889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (102222121801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51111060945 + 51111060946.

It is an arithmetic number, because the mean of its divisors is an integer number (51111060946).

Almost surely, 2^102222121891 is an apocalyptic number.

102222121891 is a deficient number, since it is larger than the sum of its proper divisors (1).

102222121891 is an equidigital number, since it uses as much as digits as its factorization.

102222121891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 102222121891 in words is "one hundred two billion, two hundred twenty-two million, one hundred twenty-one thousand, eight hundred ninety-one".