1221013222 has 16 divisors (see below), whose sum is σ = 2151716112. Its totient is φ = 512313120.

The previous prime is 1221013217. The next prime is 1221013229. The reversal of 1221013222 is 2223101221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221013196 and 1221013205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221013229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134353 + ... + 2134924.

It is an arithmetic number, because the mean of its divisors is an integer number (134482257).

Almost surely, 2^1221013222 is an apocalyptic number.

1221013222 is a deficient number, since it is larger than the sum of its proper divisors (930702890).

1221013222 is a wasteful number, since it uses less digits than its factorization.

1221013222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269303.

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

The square root of 1221013222 is about 34942.9996136565. Note that the first 3 decimals coincide. The cubic root of 1221013222 is about 1068.8254564465.

Adding to 1221013222 its reverse (2223101221), we get a palindrome (3444114443).

The spelling of 1221013222 in words is "one billion, two hundred twenty-one million, thirteen thousand, two hundred twenty-two".