21000526693 has 2 divisors, whose sum is σ = 21000526694. Its totient is φ = 21000526692.

The previous prime is 21000526691. The next prime is 21000526741. The reversal of 21000526693 is 39662500012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11266336449 + 9734190244 = 106143^2 + 98662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000526693 - 2¹ = 21000526691 is a prime.

Together with 21000526691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000526691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500263346 + 10500263347.

It is an arithmetic number, because the mean of its divisors is an integer number (10500263347).

Almost surely, 2^21000526693 is an apocalyptic number.

It is an amenable number.

21000526693 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000526693 is an equidigital number, since it uses as much as digits as its factorization.

21000526693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 21000526693 in words is "twenty-one billion, five hundred twenty-six thousand, six hundred ninety-three".