210021111101101 has 2 divisors, whose sum is σ = 210021111101102. Its totient is φ = 210021111101100.

The previous prime is 210021111101093. The next prime is 210021111101107. The reversal of 210021111101101 is 101101111120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171923206578601 + 38097904522500 = 13111949^2 + 6172350^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021111101101 - 2³ = 210021111101093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021111101107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010555550550 + 105010555550551.

It is an arithmetic number, because the mean of its divisors is an integer number (105010555550551).

Almost surely, 2^{210021111101101} is an apocalyptic number.

It is an amenable number.

210021111101101 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021111101101 is an equidigital number, since it uses as much as digits as its factorization.

210021111101101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 210021111101101 its reverse (101101111120012), we get a palindrome (311122222221113).

The spelling of 210021111101101 in words is "two hundred ten trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, one hundred one".