1221222002111 has 16 divisors (see below), whose sum is σ = 1262382448800. Its totient is φ = 1180664045568.

The previous prime is 1221222002089. The next prime is 1221222002113. The reversal of 1221222002111 is 1112002221221.

It is a cyclic number.

It is not a de Polignac number, because 1221222002111 - 2¹⁸ = 1221221739967 is a prime.

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 1221222002111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222002113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4445855 + ... + 4712543.

It is an arithmetic number, because the mean of its divisors is an integer number (78898903050).

Almost surely, 2^{1221222002111} is an apocalyptic number.

1221222002111 is a deficient number, since it is larger than the sum of its proper divisors (41160446689).

1221222002111 is a wasteful number, since it uses less digits than its factorization.

1221222002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267818.

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

Adding to 1221222002111 its reverse (1112002221221), we get a palindrome (2333224223332).

The spelling of 1221222002111 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, one hundred eleven".