122218402 has 4 divisors (see below), whose sum is σ = 183327606. Its totient is φ = 61109200.

The previous prime is 122218387. The next prime is 122218403. The reversal of 122218402 is 204812221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204812221 = 8293 ⋅24697.

It can be written as a sum of positive squares in only one way, i.e., 121903681 + 314721 = 11041^2 + 561^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (122218403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554599 + ... + 30554602.

Almost surely, 2^122218402 is an apocalyptic number.

122218402 is a deficient number, since it is larger than the sum of its proper divisors (61109204).

122218402 is an equidigital number, since it uses as much as digits as its factorization.

122218402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61109203.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 122218402 is about 11055.2431904504. The cubic root of 122218402 is about 496.2633470810.

The spelling of 122218402 in words is "one hundred twenty-two million, two hundred eighteen thousand, four hundred two".