121221112012101 has 56 divisors (see below), whose sum is σ = 185625784380960. Its totient is φ = 79107925984416.

The previous prime is 121221112012097. The next prime is 121221112012109. The reversal of 121221112012101 is 101210211122121.

It is a happy number.

121221112012101 is a `hidden beast` number, since 1 + 21 + 221 + 11 + 201 + 210 + 1 = 666.

It is not a de Polignac number, because 121221112012101 - 2² = 121221112012097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221112012109) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2594751 + ... + 15785276.

It is an arithmetic number, because the mean of its divisors is an integer number (3314746149660).

Almost surely, 2^{121221112012101} is an apocalyptic number.

It is an amenable number.

121221112012101 is a deficient number, since it is larger than the sum of its proper divisors (64404672368859).

121221112012101 is an equidigital number, since it uses as much as digits as its factorization.

121221112012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18380237 (or 18380222 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121221112012101 its reverse (101210211122121), we get a palindrome (222431323134222).

The spelling of 121221112012101 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twelve thousand, one hundred one".