1221200101111 has 8 divisors (see below), whose sum is σ = 1222275127680. Its totient is φ = 1220125209312.

The previous prime is 1221200101097. The next prime is 1221200101153. The reversal of 1221200101111 is 1111010021221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221200101111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221200101091 and 1221200101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221200141111) 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, 28310586 + ... + 28353688.

It is an arithmetic number, because the mean of its divisors is an integer number (152784390960).

Almost surely, 2^{1221200101111} is an apocalyptic number.

1221200101111 is a deficient number, since it is larger than the sum of its proper divisors (1075026569).

1221200101111 is a wasteful number, since it uses less digits than its factorization.

1221200101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67385.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221200101111 its reverse (1111010021221), we get a palindrome (2332210122332).

The spelling of 1221200101111 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, one hundred eleven".