122215421 has 2 divisors, whose sum is σ = 122215422. Its totient is φ = 122215420.

The previous prime is 122215393. The next prime is 122215427. The reversal of 122215421 is 124512221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 7425625 = 10714^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 122215421 - 2¹⁴ = 122199037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122215393 and 122215402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122215427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61107710 + 61107711.

It is an arithmetic number, because the mean of its divisors is an integer number (61107711).

Almost surely, 2^122215421 is an apocalyptic number.

It is an amenable number.

122215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122215421 is an equidigital number, since it uses as much as digits as its factorization.

122215421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 20.

The square root of 122215421 is about 11055.1083667235. The cubic root of 122215421 is about 496.2593123011.

Adding to 122215421 its reverse (124512221), we get a palindrome (246727642).

The spelling of 122215421 in words is "one hundred twenty-two million, two hundred fifteen thousand, four hundred twenty-one".