21202100122111 has 2 divisors, whose sum is σ = 21202100122112. Its totient is φ = 21202100122110.

The previous prime is 21202100122103. The next prime is 21202100122129. The reversal of 21202100122111 is 11122100120212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202100122111 - 2³ = 21202100122103 is a prime.

It is a super-2 number, since 2×21202100122111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202100102111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050061055 + 10601050061056.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050061056).

Almost surely, 2^{21202100122111} is an apocalyptic number.

21202100122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202100122111 is an equidigital number, since it uses as much as digits as its factorization.

21202100122111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21202100122111 its reverse (11122100120212), we get a palindrome (32324200242323).

The spelling of 21202100122111 in words is "twenty-one trillion, two hundred two billion, one hundred million, one hundred twenty-two thousand, one hundred eleven".