1221100022111 has 8 divisors (see below), whose sum is σ = 1227014563104. Its totient is φ = 1215192487680.

The previous prime is 1221100022069. The next prime is 1221100022113. The reversal of 1221100022111 is 1112200011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221100022111 - 2³⁴ = 1203920152927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100022113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1402070 + ... + 2099523.

It is an arithmetic number, because the mean of its divisors is an integer number (153376820388).

Almost surely, 2^{1221100022111} is an apocalyptic number.

1221100022111 is a deficient number, since it is larger than the sum of its proper divisors (5914540993).

1221100022111 is a wasteful number, since it uses less digits than its factorization.

1221100022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503281.

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

Adding to 1221100022111 its reverse (1112200011221), we get a palindrome (2333300033332).

The spelling of 1221100022111 in words is "one trillion, two hundred twenty-one billion, one hundred million, twenty-two thousand, one hundred eleven".