1221302122 has 4 divisors (see below), whose sum is σ = 1831953186. Its totient is φ = 610651060.

The previous prime is 1221302119. The next prime is 1221302149. The reversal of 1221302122 is 2212031221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 943779841 + 277522281 = 30721^2 + 16659^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221302096 and 1221302105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305325529 + ... + 305325532.

Almost surely, 2^1221302122 is an apocalyptic number.

1221302122 is a deficient number, since it is larger than the sum of its proper divisors (610651064).

1221302122 is an equidigital number, since it uses as much as digits as its factorization.

1221302122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610651063.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221302122 is about 34947.1332443736. The cubic root of 1221302122 is about 1068.9097469135.

Adding to 1221302122 its reverse (2212031221), we get a palindrome (3433333343).

The spelling of 1221302122 in words is "one billion, two hundred twenty-one million, three hundred two thousand, one hundred twenty-two".