1221101122101 has 32 divisors (see below), whose sum is σ = 1885610388480. Its totient is φ = 688501845504.

The previous prime is 1221101122099. The next prime is 1221101122139. The reversal of 1221101122101 is 1012211011221.

It is a happy number.

It is not a de Polignac number, because 1221101122101 - 2¹ = 1221101122099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221101122601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 807420 + ... + 1759013.

It is an arithmetic number, because the mean of its divisors is an integer number (58925324640).

Almost surely, 2^{1221101122101} is an apocalyptic number.

It is an amenable number.

1221101122101 is a deficient number, since it is larger than the sum of its proper divisors (664509266379).

1221101122101 is a wasteful number, since it uses less digits than its factorization.

1221101122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566745.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221101122101 its reverse (1012211011221), we get a palindrome (2233312133322).

The spelling of 1221101122101 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, one hundred one".