1221002222 has 32 divisors (see below), whose sum is σ = 2054916864. Its totient is φ = 539300800.

The previous prime is 1221002213. The next prime is 1221002261. The reversal of 1221002222 is 2222001221.

It is a super-2 number, since 2×1221002222² = 2981692852257874568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221002197 and 1221002206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234653 + ... + 239799.

It is an arithmetic number, because the mean of its divisors is an integer number (64216152).

Almost surely, 2^1221002222 is an apocalyptic number.

1221002222 is a deficient number, since it is larger than the sum of its proper divisors (833914642).

1221002222 is a wasteful number, since it uses less digits than its factorization.

1221002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5464.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1221002222 is about 34942.8422141073. The cubic root of 1221002222 is about 1068.8222467855.

Adding to 1221002222 its reverse (2222001221), we get a palindrome (3443003443).

The spelling of 1221002222 in words is "one billion, two hundred twenty-one million, two thousand, two hundred twenty-two".