21526412623 has 2 divisors, whose sum is σ = 21526412624. Its totient is φ = 21526412622.

The previous prime is 21526412599. The next prime is 21526412641. The reversal of 21526412623 is 32621462512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21526412623 - 2³³ = 12936478031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21526412683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763206311 + 10763206312.

It is an arithmetic number, because the mean of its divisors is an integer number (10763206312).

Almost surely, 2^21526412623 is an apocalyptic number.

21526412623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21526412623 is an equidigital number, since it uses as much as digits as its factorization.

21526412623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 34.

The spelling of 21526412623 in words is "twenty-one billion, five hundred twenty-six million, four hundred twelve thousand, six hundred twenty-three".