21002111001101 has 2 divisors, whose sum is σ = 21002111001102. Its totient is φ = 21002111001100.

The previous prime is 21002111001037. The next prime is 21002111001107. The reversal of 21002111001101 is 10110011120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15886394379076 + 5115716622025 = 3985774^2 + 2261795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002111001101 - 2⁶ = 21002111001037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002111001107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501055500550 + 10501055500551.

It is an arithmetic number, because the mean of its divisors is an integer number (10501055500551).

Almost surely, 2^{21002111001101} is an apocalyptic number.

It is an amenable number.

21002111001101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002111001101 is an equidigital number, since it uses as much as digits as its factorization.

21002111001101 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 21002111001101 its reverse (10110011120012), we get a palindrome (31112122121113).

The spelling of 21002111001101 in words is "twenty-one trillion, two billion, one hundred eleven million, one thousand, one hundred one".