1220121112101 has 32 divisors (see below), whose sum is σ = 1693967696640. Its totient is φ = 780457711104.

The previous prime is 1220121111991. The next prime is 1220121112109. The reversal of 1220121112101 is 1012111210221.

It is a happy number.

It is not a de Polignac number, because 1220121112101 - 2³⁴ = 1202941242917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121112109) 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, 78745311 + ... + 78760803.

It is an arithmetic number, because the mean of its divisors is an integer number (52936490520).

Almost surely, 2^{1220121112101} is an apocalyptic number.

It is an amenable number.

1220121112101 is a deficient number, since it is larger than the sum of its proper divisors (473846584539).

1220121112101 is a wasteful number, since it uses less digits than its factorization.

1220121112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25325.

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

Adding to 1220121112101 its reverse (1012111210221), we get a palindrome (2232232322322).

The spelling of 1220121112101 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred one".