1221220112210 has 16 divisors (see below), whose sum is σ = 2512224230976. Its totient is φ = 418704038448.

The previous prime is 1221220112201. The next prime is 1221220112219. The reversal of 1221220112210 is 122110221221.

It is an interprime number because it is at equal distance from previous prime (1221220112201) and next prime (1221220112219).

It is not an unprimeable number, because it can be changed into a prime (1221220112219) 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, 8723000732 + ... + 8723000871.

It is an arithmetic number, because the mean of its divisors is an integer number (157014014436).

Almost surely, 2^{1221220112210} is an apocalyptic number.

1221220112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220112210 is an abundant number, since it is smaller than the sum of its proper divisors (1291004118766).

1221220112210 is a wasteful number, since it uses less digits than its factorization.

1221220112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17446001617.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221220112210 its reverse (122110221221), we get a palindrome (1343330333431).

The spelling of 1221220112210 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred ten".