21020022102111 has 4 divisors (see below), whose sum is σ = 28026696136152. Its totient is φ = 14013348068072.

The previous prime is 21020022102089. The next prime is 21020022102119. The reversal of 21020022102111 is 11120122002012.

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 21020022102111 - 2⁶ = 21020022102047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020022102119) 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, 3503337017016 + ... + 3503337017021.

It is an arithmetic number, because the mean of its divisors is an integer number (7006674034038).

Almost surely, 2^{21020022102111} is an apocalyptic number.

21020022102111 is a deficient number, since it is larger than the sum of its proper divisors (7006674034041).

21020022102111 is an equidigital number, since it uses as much as digits as its factorization.

21020022102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006674034040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020022102111 its reverse (11120122002012), we get a palindrome (32140144104123).

The spelling of 21020022102111 in words is "twenty-one trillion, twenty billion, twenty-two million, one hundred two thousand, one hundred eleven".