21513529463 has 2 divisors, whose sum is σ = 21513529464. Its totient is φ = 21513529462.

The previous prime is 21513529337. The next prime is 21513529483. The reversal of 21513529463 is 36492531512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21513529463 - 2¹² = 21513525367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21513529463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21513529483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756764731 + 10756764732.

It is an arithmetic number, because the mean of its divisors is an integer number (10756764732).

Almost surely, 2^21513529463 is an apocalyptic number.

21513529463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21513529463 is an equidigital number, since it uses as much as digits as its factorization.

21513529463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The spelling of 21513529463 in words is "twenty-one billion, five hundred thirteen million, five hundred twenty-nine thousand, four hundred sixty-three".