21071027231 has 2 divisors, whose sum is σ = 21071027232. Its totient is φ = 21071027230.

The previous prime is 21071027183. The next prime is 21071027249. The reversal of 21071027231 is 13272017012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21071027231 - 2⁶ = 21071027167 is a prime.

It is a super-2 number, since 2×21071027231² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21071027231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21071023231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10535513615 + 10535513616.

It is an arithmetic number, because the mean of its divisors is an integer number (10535513616).

Almost surely, 2^21071027231 is an apocalyptic number.

21071027231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071027231 is an equidigital number, since it uses as much as digits as its factorization.

21071027231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The spelling of 21071027231 in words is "twenty-one billion, seventy-one million, twenty-seven thousand, two hundred thirty-one".