1221112210 has 32 divisors (see below), whose sum is σ = 2329160832. Its totient is φ = 459344640.

The previous prime is 1221112201. The next prime is 1221112241. The reversal of 1221112210 is 122111221.

It is a super-2 number, since 2×1221112210² = 2982230058822168200, which contains 22 as substring.

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, 309309 + ... + 313231.

It is an arithmetic number, because the mean of its divisors is an integer number (72786276).

Almost surely, 2^1221112210 is an apocalyptic number.

1221112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221112210 is a deficient number, since it is larger than the sum of its proper divisors (1108048622).

1221112210 is a wasteful number, since it uses less digits than its factorization.

1221112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1221112210 is about 34944.4160059944. The cubic root of 1221112210 is about 1068.8543390262.

Adding to 1221112210 its reverse (122111221), we get a palindrome (1343223431).

The spelling of 1221112210 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred ten".