21113500201061 has 2 divisors, whose sum is σ = 21113500201062. Its totient is φ = 21113500201060.

The previous prime is 21113500200967. The next prime is 21113500201103. The reversal of 21113500201061 is 16010200531112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15789377752225 + 5324122448836 = 3973585^2 + 2307406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113500201061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113500200061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556750100530 + 10556750100531.

It is an arithmetic number, because the mean of its divisors is an integer number (10556750100531).

Almost surely, 2^{21113500201061} is an apocalyptic number.

It is an amenable number.

21113500201061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113500201061 is an equidigital number, since it uses as much as digits as its factorization.

21113500201061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 21113500201061 its reverse (16010200531112), we get a palindrome (37123700732173).

The spelling of 21113500201061 in words is "twenty-one trillion, one hundred thirteen billion, five hundred million, two hundred one thousand, sixty-one".