21010001120111 has 2 divisors, whose sum is σ = 21010001120112. Its totient is φ = 21010001120110.

The previous prime is 21010001120099. The next prime is 21010001120117. The reversal of 21010001120111 is 11102110001012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010001120111 - 2²⁶ = 21009934011247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010001120092 and 21010001120101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010001120117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505000560055 + 10505000560056.

It is an arithmetic number, because the mean of its divisors is an integer number (10505000560056).

Almost surely, 2^{21010001120111} is an apocalyptic number.

21010001120111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010001120111 is an equidigital number, since it uses as much as digits as its factorization.

21010001120111 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 11.

Adding to 21010001120111 its reverse (11102110001012), we get a palindrome (32112111121123).

The spelling of 21010001120111 in words is "twenty-one trillion, ten billion, one million, one hundred twenty thousand, one hundred eleven".