1221102212101 has 4 divisors (see below), whose sum is σ = 1285370749600. Its totient is φ = 1156833674604.

The previous prime is 1221102212089. The next prime is 1221102212107. The reversal of 1221102212101 is 1012122011221.

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-1221102212101 is a prime.

It is a super-2 number, since 2×1221102212101² (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 (1221102212107) 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, 32134268721 + ... + 32134268758.

It is an arithmetic number, because the mean of its divisors is an integer number (321342687400).

Almost surely, 2^{1221102212101} is an apocalyptic number.

It is an amenable number.

1221102212101 is a deficient number, since it is larger than the sum of its proper divisors (64268537499).

1221102212101 is an equidigital number, since it uses as much as digits as its factorization.

1221102212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64268537498.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221102212101 its reverse (1012122011221), we get a palindrome (2233224223322).

The spelling of 1221102212101 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twelve thousand, one hundred one".