2121201111101 has 4 divisors (see below), whose sum is σ = 2121613240032. Its totient is φ = 2120788982172.

The previous prime is 2121201111067. The next prime is 2121201111103. The reversal of 2121201111101 is 1011111021212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121201111101 - 2³⁸ = 1846323204157 is a prime.

It is a super-2 number, since 2×2121201111101² (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 (2121201111103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206056745 + ... + 206067038.

It is an arithmetic number, because the mean of its divisors is an integer number (530403310008).

Almost surely, 2^{2121201111101} is an apocalyptic number.

It is an amenable number.

2121201111101 is a deficient number, since it is larger than the sum of its proper divisors (412128931).

2121201111101 is an equidigital number, since it uses as much as digits as its factorization.

2121201111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412128930.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2121201111101 its reverse (1011111021212), we get a palindrome (3132312132313).

It can be divided in two parts, 212120111 and 1101, that added together give a palindrome (212121212).

The spelling of 2121201111101 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred one".