21024134081 has 2 divisors, whose sum is σ = 21024134082. Its totient is φ = 21024134080.

The previous prime is 21024134029. The next prime is 21024134113. The reversal of 21024134081 is 18043142012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21013111681 + 11022400 = 144959^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024134081 - 2⁶ = 21024134017 is a prime.

It is a super-2 number, since 2×21024134081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21024134081.

It is not a weakly prime, because it can be changed into another prime (21024130081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512067040 + 10512067041.

It is an arithmetic number, because the mean of its divisors is an integer number (10512067041).

Almost surely, 2^21024134081 is an apocalyptic number.

It is an amenable number.

21024134081 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024134081 is an equidigital number, since it uses as much as digits as its factorization.

21024134081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21024134081 its reverse (18043142012), we get a palindrome (39067276093).

The spelling of 21024134081 in words is "twenty-one billion, twenty-four million, one hundred thirty-four thousand, eighty-one".