1221002102111 has 16 divisors (see below), whose sum is σ = 1349759496960. Its totient is φ = 1095301279680.

The previous prime is 1221002102101. The next prime is 1221002102119. The reversal of 1221002102111 is 1112012001221.

It is a cyclic number.

It is not a de Polignac number, because 1221002102111 - 2²² = 1220997907807 is a prime.

It is a super-2 number, since 2×1221002102111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002102119) 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, 2174141 + ... + 2677478.

It is an arithmetic number, because the mean of its divisors is an integer number (84359968560).

Almost surely, 2^{1221002102111} is an apocalyptic number.

1221002102111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221002102111 is a deficient number, since it is larger than the sum of its proper divisors (128757394849).

1221002102111 is a wasteful number, since it uses less digits than its factorization.

1221002102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851934.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221002102111 its reverse (1112012001221), we get a palindrome (2333014103332).

The spelling of 1221002102111 in words is "one trillion, two hundred twenty-one billion, two million, one hundred two thousand, one hundred eleven".