1221210100219 has 16 divisors (see below), whose sum is σ = 1333435046400. Its totient is φ = 1113997649184.

The previous prime is 1221210100147. The next prime is 1221210100261. The reversal of 1221210100219 is 9120010121221.

It is a cyclic number.

It is not a de Polignac number, because 1221210100219 - 2¹⁹ = 1221209575931 is a prime.

It is a super-2 number, since 2×1221210100219² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221210100219.

It is not an unprimeable number, because it can be changed into a prime (1221210103219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2817337 + ... + 3221770.

It is an arithmetic number, because the mean of its divisors is an integer number (83339690400).

Almost surely, 2^{1221210100219} is an apocalyptic number.

1221210100219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1221210100219 is a deficient number, since it is larger than the sum of its proper divisors (112224946181).

1221210100219 is a wasteful number, since it uses less digits than its factorization.

1221210100219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039522.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1221210100219 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred thousand, two hundred nineteen".