1221112202101 has 24 divisors (see below), whose sum is σ = 1372320279360. Its totient is φ = 1086480194360.

The previous prime is 1221112202087. The next prime is 1221112202117. The reversal of 1221112202101 is 1012022111221.

It is not a de Polignac number, because 1221112202101 - 2²³ = 1221103813493 is a prime.

It is a super-2 number, since 2×1221112202101² (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 (1221112208101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2732520 + ... + 3147838.

It is an arithmetic number, because the mean of its divisors is an integer number (57180011640).

Almost surely, 2^{1221112202101} is an apocalyptic number.

1221112202101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221112202101 is a deficient number, since it is larger than the sum of its proper divisors (151208077259).

1221112202101 is an frugal number, since it uses more digits than its factorization.

1221112202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415446 (or 415377 counting only the distinct ones).

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

Adding to 1221112202101 its reverse (1012022111221), we get a palindrome (2233134313322).

The spelling of 1221112202101 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred two thousand, one hundred one".