101213222991 has 4 divisors (see below), whose sum is σ = 134950963992. Its totient is φ = 67475481992.

The previous prime is 101213222939. The next prime is 101213222993. The reversal of 101213222991 is 199222312101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101213222991 - 2²³ = 101204834383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101213222993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16868870496 + ... + 16868870501.

It is an arithmetic number, because the mean of its divisors is an integer number (33737740998).

Almost surely, 2^101213222991 is an apocalyptic number.

101213222991 is a deficient number, since it is larger than the sum of its proper divisors (33737741001).

101213222991 is an equidigital number, since it uses as much as digits as its factorization.

101213222991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33737741000.

The product of its (nonzero) digits is 3888, while the sum is 33.

The spelling of 101213222991 in words is "one hundred one billion, two hundred thirteen million, two hundred twenty-two thousand, nine hundred ninety-one".