21308526311 has 2 divisors, whose sum is σ = 21308526312. Its totient is φ = 21308526310.

The previous prime is 21308526263. The next prime is 21308526331. The reversal of 21308526311 is 11362580312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21308526311 - 2¹⁸ = 21308264167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21308526331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10654263155 + 10654263156.

It is an arithmetic number, because the mean of its divisors is an integer number (10654263156).

Almost surely, 2^21308526311 is an apocalyptic number.

21308526311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21308526311 is an equidigital number, since it uses as much as digits as its factorization.

21308526311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21308526311 in words is "twenty-one billion, three hundred eight million, five hundred twenty-six thousand, three hundred eleven".