1221100100111 has 8 divisors (see below), whose sum is σ = 1253389830000. Its totient is φ = 1188929741760.

The previous prime is 1221100100107. The next prime is 1221100100167. The reversal of 1221100100111 is 1110010011221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221100100111 - 2² = 1221100100107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221100100092 and 1221100100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100100911) 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, 29822156 + ... + 29863073.

It is an arithmetic number, because the mean of its divisors is an integer number (156673728750).

Almost surely, 2^{1221100100111} is an apocalyptic number.

1221100100111 is a deficient number, since it is larger than the sum of its proper divisors (32289729889).

1221100100111 is an equidigital number, since it uses as much as digits as its factorization.

1221100100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59685769.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1221100100111 its reverse (1110010011221), we get a palindrome (2331110111332).

The spelling of 1221100100111 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred thousand, one hundred eleven".