122219821 has 2 divisors, whose sum is σ = 122219822. Its totient is φ = 122219820.

The previous prime is 122219813. The next prime is 122219831. The reversal of 122219821 is 128912221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103815721 + 18404100 = 10189^2 + 4290^2 .

It is a cyclic number.

It is not a de Polignac number, because 122219821 - 2³ = 122219813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122219821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122219831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61109910 + 61109911.

It is an arithmetic number, because the mean of its divisors is an integer number (61109911).

Almost surely, 2^122219821 is an apocalyptic number.

It is an amenable number.

122219821 is a deficient number, since it is larger than the sum of its proper divisors (1).

122219821 is an equidigital number, since it uses as much as digits as its factorization.

122219821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

The square root of 122219821 is about 11055.3073679568. The cubic root of 122219821 is about 496.2652676727.

The spelling of 122219821 in words is "one hundred twenty-two million, two hundred nineteen thousand, eight hundred twenty-one".