21526402543 has 2 divisors, whose sum is σ = 21526402544. Its totient is φ = 21526402542.

The previous prime is 21526402529. The next prime is 21526402553. The reversal of 21526402543 is 34520462512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21526402543 - 2²¹ = 21524305391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21526402499 and 21526402508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21526402553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763201271 + 10763201272.

It is an arithmetic number, because the mean of its divisors is an integer number (10763201272).

Almost surely, 2^21526402543 is an apocalyptic number.

21526402543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21526402543 is an equidigital number, since it uses as much as digits as its factorization.

21526402543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 21526402543 in words is "twenty-one billion, five hundred twenty-six million, four hundred two thousand, five hundred forty-three".