2021201222111 has 4 divisors (see below), whose sum is σ = 2026143034800. Its totient is φ = 2016259409424.

The previous prime is 2021201222101. The next prime is 2021201222119. The reversal of 2021201222111 is 1112221021202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021201222111 - 2³⁸ = 1746323315167 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 2021201222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021201222119) 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, 2470905731 + ... + 2470906548.

It is an arithmetic number, because the mean of its divisors is an integer number (506535758700).

Almost surely, 2^{2021201222111} is an apocalyptic number.

2021201222111 is a deficient number, since it is larger than the sum of its proper divisors (4941812689).

2021201222111 is an equidigital number, since it uses as much as digits as its factorization.

2021201222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941812688.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2021201222111 its reverse (1112221021202), we get a palindrome (3133422243313).

The spelling of 2021201222111 in words is "two trillion, twenty-one billion, two hundred one million, two hundred twenty-two thousand, one hundred eleven".