122220421 has 2 divisors, whose sum is σ = 122220422. Its totient is φ = 122220420.

The previous prime is 122220409. The next prime is 122220437. The reversal of 122220421 is 124022221.

It is an a-pointer prime, because the next prime (122220437) can be obtained adding 122220421 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 7396 = 11055^2 + 86^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122220421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122220395 and 122220404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122220401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61110210 + 61110211.

It is an arithmetic number, because the mean of its divisors is an integer number (61110211).

Almost surely, 2^122220421 is an apocalyptic number.

It is an amenable number.

122220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122220421 is an equidigital number, since it uses as much as digits as its factorization.

122220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 122220421 is about 11055.3345042111. The cubic root of 122220421 is about 496.2660797578.

Adding to 122220421 its reverse (124022221), we get a palindrome (246242642).

The spelling of 122220421 in words is "one hundred twenty-two million, two hundred twenty thousand, four hundred twenty-one".