1221102210 has 32 divisors (see below), whose sum is σ = 2967747840. Its totient is φ = 321504768.

The previous prime is 1221102193. The next prime is 1221102229. The reversal of 1221102210 is 122011221.

It is a Curzon 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, 255247 + ... + 259986.

It is an arithmetic number, because the mean of its divisors is an integer number (92742120).

Almost surely, 2^1221102210 is an apocalyptic number.

1221102210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221102210 is an abundant number, since it is smaller than the sum of its proper divisors (1746645630).

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

1221102210 is a wasteful number, since it uses less digits than its factorization.

1221102210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515322.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221102210 is about 34944.2729213243. The cubic root of 1221102210 is about 1068.8514213111.

Adding to 1221102210 its reverse (122011221), we get a palindrome (1343113431).

The spelling of 1221102210 in words is "one billion, two hundred twenty-one million, one hundred two thousand, two hundred ten".