21531350521304 has 64 divisors (see below), whose sum is σ = 44028904819200. Its totient is φ = 9811353412224.

The previous prime is 21531350521253. The next prime is 21531350521309. The reversal of 21531350521304 is 40312505313512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531350521309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310094639 + ... + 310164065.

It is an arithmetic number, because the mean of its divisors is an integer number (687951637800).

Almost surely, 2^{21531350521304} is an apocalyptic number.

It is an amenable number.

21531350521304 is an abundant number, since it is smaller than the sum of its proper divisors (22497554297896).

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

21531350521304 is a wasteful number, since it uses less digits than its factorization.

21531350521304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107272 (or 107268 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 21531350521304 its reverse (40312505313512), we get a palindrome (61843855834816).

The spelling of 21531350521304 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty million, five hundred twenty-one thousand, three hundred four".