221012130091 has 2 divisors, whose sum is σ = 221012130092. Its totient is φ = 221012130090.

The previous prime is 221012130083. The next prime is 221012130121. The reversal of 221012130091 is 190031210122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221012130091 - 2³ = 221012130083 is a prime.

It is a super-2 number, since 2×221012130091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221012130191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506065045 + 110506065046.

It is an arithmetic number, because the mean of its divisors is an integer number (110506065046).

Almost surely, 2^221012130091 is an apocalyptic number.

221012130091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012130091 is an equidigital number, since it uses as much as digits as its factorization.

221012130091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 221012130091 in words is "two hundred twenty-one billion, twelve million, one hundred thirty thousand, ninety-one".