21523033410 has 64 divisors (see below), whose sum is σ = 52671047040. Its totient is φ = 5626782720.

The previous prime is 21523033397. The next prime is 21523033417. The reversal of 21523033410 is 1433032512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21523033417) 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 31 ways as a sum of consecutive naturals, for example, 2362965 + ... + 2372055.

It is an arithmetic number, because the mean of its divisors is an integer number (822985110).

Almost surely, 2^21523033410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21523033410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26335523520).

21523033410 is an abundant number, since it is smaller than the sum of its proper divisors (31148013630).

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

21523033410 is a wasteful number, since it uses less digits than its factorization.

21523033410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21523033410 its reverse (1433032512), we get a palindrome (22956065922).

The spelling of 21523033410 in words is "twenty-one billion, five hundred twenty-three million, thirty-three thousand, four hundred ten".