1221222100210 has 64 divisors (see below), whose sum is σ = 2662083055872. Its totient is φ = 393767387136.

The previous prime is 1221222100093. The next prime is 1221222100243. The reversal of 1221222100210 is 120012221221.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1126834 + ... + 1926706.

It is an arithmetic number, because the mean of its divisors is an integer number (41595047748).

Almost surely, 2^{1221222100210} is an apocalyptic number.

1221222100210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221222100210 is an abundant number, since it is smaller than the sum of its proper divisors (1440860955662).

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

1221222100210 is a wasteful number, since it uses less digits than its factorization.

1221222100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801187.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221222100210 its reverse (120012221221), we get a palindrome (1341234321431).

The spelling of 1221222100210 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred ten".