21020210222111 has 4 divisors (see below), whose sum is σ = 21025752068832. Its totient is φ = 21014668375392.

The previous prime is 21020210222107. The next prime is 21020210222149. The reversal of 21020210222111 is 11122201202012.

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 21020210222111 - 2² = 21020210222107 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 21020210222111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020210222191) 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, 2770917671 + ... + 2770925256.

It is an arithmetic number, because the mean of its divisors is an integer number (5256438017208).

Almost surely, 2^{21020210222111} is an apocalyptic number.

21020210222111 is a deficient number, since it is larger than the sum of its proper divisors (5541846721).

21020210222111 is an equidigital number, since it uses as much as digits as its factorization.

21020210222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5541846720.

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

Adding to 21020210222111 its reverse (11122201202012), we get a palindrome (32142411424123).

The spelling of 21020210222111 in words is "twenty-one trillion, twenty billion, two hundred ten million, two hundred twenty-two thousand, one hundred eleven".