1221212120010 has 16 divisors (see below), whose sum is σ = 2930909088096. Its totient is φ = 325656565328.

The previous prime is 1221212119999. The next prime is 1221212120027. The reversal of 1221212120010 is 100212121221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20353535304 + ... + 20353535363.

It is an arithmetic number, because the mean of its divisors is an integer number (183181818006).

Almost surely, 2^{1221212120010} is an apocalyptic number.

1221212120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221212120010 is an abundant number, since it is smaller than the sum of its proper divisors (1709696968086).

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

1221212120010 is a wasteful number, since it uses less digits than its factorization.

1221212120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40707070677.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221212120010 its reverse (100212121221), we get a palindrome (1321424241231).

The spelling of 1221212120010 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, ten".