122320219991 has 4 divisors (see below), whose sum is σ = 122353203000. Its totient is φ = 122287236984.

The previous prime is 122320219979. The next prime is 122320220017. The reversal of 122320219991 is 199912023221.

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 122320219991 - 2¹⁸ = 122319957847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122320219961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16485941 + ... + 16493358.

It is an arithmetic number, because the mean of its divisors is an integer number (30588300750).

Almost surely, 2^122320219991 is an apocalyptic number.

122320219991 is a deficient number, since it is larger than the sum of its proper divisors (32983009).

122320219991 is an equidigital number, since it uses as much as digits as its factorization.

122320219991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32983008.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 122320219991 in words is "one hundred twenty-two billion, three hundred twenty million, two hundred nineteen thousand, nine hundred ninety-one".