21543264498 has 64 divisors (see below), whose sum is σ = 49543925760. Its totient is φ = 6117552000.

The previous prime is 21543264397. The next prime is 21543264503. The reversal of 21543264498 is 89446234512.

It is a super-2 number, since 2×21543264498² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6031053 + ... + 6034623.

It is an arithmetic number, because the mean of its divisors is an integer number (774123840).

Almost surely, 2^21543264498 is an apocalyptic number.

21543264498 is an abundant number, since it is smaller than the sum of its proper divisors (28000661262).

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

21543264498 is a wasteful number, since it uses less digits than its factorization.

21543264498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423.

The product of its digits is 1658880, while the sum is 48.

The spelling of 21543264498 in words is "twenty-one billion, five hundred forty-three million, two hundred sixty-four thousand, four hundred ninety-eight".