21485272536 has 96 divisors (see below), whose sum is σ = 71617596960. Its totient is φ = 5666443776.

The previous prime is 21485272531. The next prime is 21485272541. The reversal of 21485272536 is 63527258412.

21485272536 is a `hidden beast` number, since 2 + 1 + 48 + 5 + 2 + 72 + 536 = 666.

It is an interprime number because it is at equal distance from previous prime (21485272531) and next prime (21485272541).

It is a junction number, because it is equal to n+sod(n) for n = 21485272491 and 21485272500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485272531) 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 23 ways as a sum of consecutive naturals, for example, 1633045 + ... + 1646148.

It is an arithmetic number, because the mean of its divisors is an integer number (746016635).

Almost surely, 2^21485272536 is an apocalyptic number.

21485272536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21485272536 is an abundant number, since it is smaller than the sum of its proper divisors (50132324424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21485272536 is a wasteful number, since it uses less digits than its factorization.

21485272536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279225 (or 3279218 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 21485272536 in words is "twenty-one billion, four hundred eighty-five million, two hundred seventy-two thousand, five hundred thirty-six".