21011012110061 has 2 divisors, whose sum is σ = 21011012110062. Its totient is φ = 21011012110060.

The previous prime is 21011012110051. The next prime is 21011012110069. The reversal of 21011012110061 is 16001121011012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17222126502025 + 3788885608036 = 4149955^2 + 1946506^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011012110061 - 2²⁶ = 21010945001197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011012110069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505506055030 + 10505506055031.

It is an arithmetic number, because the mean of its divisors is an integer number (10505506055031).

Almost surely, 2^{21011012110061} is an apocalyptic number.

It is an amenable number.

21011012110061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011012110061 is an equidigital number, since it uses as much as digits as its factorization.

21011012110061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21011012110061 its reverse (16001121011012), we get a palindrome (37012133121073).

The spelling of 21011012110061 in words is "twenty-one trillion, eleven billion, twelve million, one hundred ten thousand, sixty-one".