1221122210 has 192 divisors, whose sum is σ = 3033759744. Its totient is φ = 343094400.

The previous prime is 1221122207. The next prime is 1221122239. The reversal of 1221122210 is 122211221.

It is a super-2 number, since 2×1221122210² = 2982278903510568200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6393215 + ... + 6393405.

It is an arithmetic number, because the mean of its divisors is an integer number (15800832).

Almost surely, 2^1221122210 is an apocalyptic number.

1221122210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221122210 is an abundant number, since it is smaller than the sum of its proper divisors (1812637534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221122210 is a wasteful number, since it uses less digits than its factorization.

1221122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221122210 is about 34944.5590900787. The cubic root of 1221122210 is about 1068.8572567254.

Adding to 1221122210 its reverse (122211221), we get a palindrome (1343333431).

The spelling of 1221122210 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred ten".