21221202002111 has 2 divisors, whose sum is σ = 21221202002112. Its totient is φ = 21221202002110.

The previous prime is 21221202002101. The next prime is 21221202002129. The reversal of 21221202002111 is 11120020212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221202002111 - 2³⁸ = 20946324095167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221202002111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221202002101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610601001055 + 10610601001056.

It is an arithmetic number, because the mean of its divisors is an integer number (10610601001056).

Almost surely, 2^{21221202002111} is an apocalyptic number.

21221202002111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221202002111 is an equidigital number, since it uses as much as digits as its factorization.

21221202002111 is an evil number, because the sum of its binary digits is even.

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

Adding to 21221202002111 its reverse (11120020212212), we get a palindrome (32341222214323).

The spelling of 21221202002111 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, two thousand, one hundred eleven".