21545204322 has 64 divisors (see below), whose sum is σ = 45735819264. Its totient is φ = 6752148480.

The previous prime is 21545204297. The next prime is 21545204333. The reversal of 21545204322 is 22340254512.

It is a self number, because there is not a number n which added to its sum of digits gives 21545204322.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3396738 + ... + 3403074.

It is an arithmetic number, because the mean of its divisors is an integer number (714622176).

Almost surely, 2^21545204322 is an apocalyptic number.

21545204322 is an abundant number, since it is smaller than the sum of its proper divisors (24190614942).

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

21545204322 is a wasteful number, since it uses less digits than its factorization.

21545204322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21545204322 its reverse (22340254512), we get a palindrome (43885458834).

The spelling of 21545204322 in words is "twenty-one billion, five hundred forty-five million, two hundred four thousand, three hundred twenty-two".