1221110001101 has 4 divisors (see below), whose sum is σ = 1221245583552. Its totient is φ = 1220974418652.

The previous prime is 1221110001019. The next prime is 1221110001103. The reversal of 1221110001101 is 1011000111221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221110001101 is a prime.

It is a super-3 number, since 3×1221110001101³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110001103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67777715 + ... + 67795728.

It is an arithmetic number, because the mean of its divisors is an integer number (305311395888).

Almost surely, 2^{1221110001101} is an apocalyptic number.

It is an amenable number.

1221110001101 is a deficient number, since it is larger than the sum of its proper divisors (135582451).

1221110001101 is an equidigital number, since it uses as much as digits as its factorization.

1221110001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135582450.

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

Adding to 1221110001101 its reverse (1011000111221), we get a palindrome (2232110112322).

The spelling of 1221110001101 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one thousand, one hundred one".