21524356340 has 48 divisors (see below), whose sum is σ = 49648878720. Its totient is φ = 7801960320.

The previous prime is 21524356313. The next prime is 21524356369. The reversal of 21524356340 is 4365342512.

It is a self number, because there is not a number n which added to its sum of digits gives 21524356340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222631 + ... + 1240110.

It is an arithmetic number, because the mean of its divisors is an integer number (1034351640).

Almost surely, 2^21524356340 is an apocalyptic number.

21524356340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21524356340 is an abundant number, since it is smaller than the sum of its proper divisors (28124522380).

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

21524356340 is a wasteful number, since it uses less digits than its factorization.

21524356340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462792 (or 2462790 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21524356340 its reverse (4365342512), we get a palindrome (25889698852).

The spelling of 21524356340 in words is "twenty-one billion, five hundred twenty-four million, three hundred fifty-six thousand, three hundred forty".