221202100091 has 8 divisors (see below), whose sum is σ = 253599886560. Its totient is φ = 189003685248.

The previous prime is 221202100081. The next prime is 221202100121. The reversal of 221202100091 is 190001202122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221202100091 - 2¹⁸ = 221201837947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221202100051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49840526 + ... + 49844963.

It is an arithmetic number, because the mean of its divisors is an integer number (31699985820).

Almost surely, 2^221202100091 is an apocalyptic number.

221202100091 is a deficient number, since it is larger than the sum of its proper divisors (32397786469).

221202100091 is an equidigital number, since it uses as much as digits as its factorization.

221202100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99685813.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 221202100091 in words is "two hundred twenty-one billion, two hundred two million, one hundred thousand, ninety-one".