1221222222010 has 48 divisors (see below), whose sum is σ = 2691673489440. Its totient is φ = 396667666080.

The previous prime is 1221222222007. The next prime is 1221222222221. The reversal of 1221222222010 is 102222221221.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65577276 + ... + 65595895.

It is an arithmetic number, because the mean of its divisors is an integer number (56076531030).

Almost surely, 2^{1221222222010} is an apocalyptic number.

1221222222010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221222222010 is an abundant number, since it is smaller than the sum of its proper divisors (1470451267430).

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

1221222222010 is a wasteful number, since it uses less digits than its factorization.

1221222222010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131173211 (or 131173204 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221222222010 its reverse (102222221221), we get a palindrome (1323444443231).

The spelling of 1221222222010 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, ten".