1221101002111 has 8 divisors (see below), whose sum is σ = 1259279154000. Its totient is φ = 1183322621760.

The previous prime is 1221101002063. The next prime is 1221101002271. The reversal of 1221101002111 is 1112001011221.

It is a happy number.

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

It is not a de Polignac number, because 1221101002111 - 2⁹ = 1221101001599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221101002091 and 1221101002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221101009111) 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, 99936681 + ... + 99948898.

It is an arithmetic number, because the mean of its divisors is an integer number (157409894250).

Almost surely, 2^{1221101002111} is an apocalyptic number.

1221101002111 is a deficient number, since it is larger than the sum of its proper divisors (38178151889).

1221101002111 is a wasteful number, since it uses less digits than its factorization.

1221101002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199885769.

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

Adding to 1221101002111 its reverse (1112001011221), we get a palindrome (2333102013332).

The spelling of 1221101002111 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two thousand, one hundred eleven".