121111112220101 has 48 divisors (see below), whose sum is σ = 128636509996800. Its totient is φ = 113988383308800.

The previous prime is 121111112220023. The next prime is 121111112220103. The reversal of 121111112220101 is 101022211111121.

It is not a de Polignac number, because 121111112220101 - 2⁴² = 116713065708997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121111112220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111112220103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4085917241 + ... + 4085946881.

It is an arithmetic number, because the mean of its divisors is an integer number (2679927291600).

Almost surely, 2^{121111112220101} is an apocalyptic number.

It is an amenable number.

121111112220101 is a deficient number, since it is larger than the sum of its proper divisors (7525397776699).

121111112220101 is an equidigital number, since it uses as much as digits as its factorization.

121111112220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30558 (or 30529 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121111112220101 its reverse (101022211111121), we get a palindrome (222133323331222).

The spelling of 121111112220101 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty thousand, one hundred one".