122198821 has 4 divisors (see below), whose sum is σ = 124022752. Its totient is φ = 120374892.

The previous prime is 122198803. The next prime is 122198849. The reversal of 122198821 is 128891221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122198821 - 2⁷ = 122198693 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 (122198801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911865 + ... + 911998.

It is an arithmetic number, because the mean of its divisors is an integer number (31005688).

Almost surely, 2^122198821 is an apocalyptic number.

It is an amenable number.

122198821 is a deficient number, since it is larger than the sum of its proper divisors (1823931).

122198821 is an equidigital number, since it uses as much as digits as its factorization.

122198821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823930.

The product of its digits is 4608, while the sum is 34.

The square root of 122198821 is about 11054.3575570903. The cubic root of 122198821 is about 496.2368430209.

The spelling of 122198821 in words is "one hundred twenty-two million, one hundred ninety-eight thousand, eight hundred twenty-one".