102011220991 has 2 divisors, whose sum is σ = 102011220992. Its totient is φ = 102011220990.

The previous prime is 102011220947. The next prime is 102011221043. The reversal of 102011220991 is 199022110201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102011220991 - 2⁷ = 102011220863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102011220691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005610495 + 51005610496.

It is an arithmetic number, because the mean of its divisors is an integer number (51005610496).

Almost surely, 2^102011220991 is an apocalyptic number.

102011220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102011220991 is an equidigital number, since it uses as much as digits as its factorization.

102011220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 102011220991 in words is "one hundred two billion, eleven million, two hundred twenty thousand, nine hundred ninety-one".