1221010211101 has 8 divisors (see below), whose sum is σ = 1222643036160. Its totient is φ = 1219378268208.

The previous prime is 1221010211093. The next prime is 1221010211143. The reversal of 1221010211101 is 1011120101221.

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 not a de Polignac number, because 1221010211101 - 2³ = 1221010211093 is a prime.

It is a super-2 number, since 2×1221010211101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010211501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2573115 + ... + 3010471.

It is an arithmetic number, because the mean of its divisors is an integer number (152830379520).

Almost surely, 2^{1221010211101} is an apocalyptic number.

It is an amenable number.

1221010211101 is a deficient number, since it is larger than the sum of its proper divisors (1632825059).

1221010211101 is a wasteful number, since it uses less digits than its factorization.

1221010211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441083.

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

Adding to 1221010211101 its reverse (1011120101221), we get a palindrome (2232130312322).

The spelling of 1221010211101 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred eleven thousand, one hundred one".