21534825063 has 16 divisors (see below), whose sum is σ = 29498489216. Its totient is φ = 13964101920.

The previous prime is 21534825047. The next prime is 21534825079. The reversal of 21534825063 is 36052843512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21534825047) and next prime (21534825079).

It is not a de Polignac number, because 21534825063 - 2⁴ = 21534825047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534825083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340620 + ... + 398862.

It is an arithmetic number, because the mean of its divisors is an integer number (1843655576).

Almost surely, 2^21534825063 is an apocalyptic number.

21534825063 is a deficient number, since it is larger than the sum of its proper divisors (7963664153).

21534825063 is a wasteful number, since it uses less digits than its factorization.

21534825063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61614.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 21534825063 in words is "twenty-one billion, five hundred thirty-four million, eight hundred twenty-five thousand, sixty-three".