21533500201304 has 64 divisors (see below), whose sum is σ = 49693597900800. Its totient is φ = 8518592168064.

The previous prime is 21533500201277. The next prime is 21533500201313. The reversal of 21533500201304 is 40310200533512.

It is a happy number.

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, 44931857 + ... + 45408575.

It is an arithmetic number, because the mean of its divisors is an integer number (776462467200).

Almost surely, 2^{21533500201304} is an apocalyptic number.

It is an amenable number.

21533500201304 is an abundant number, since it is smaller than the sum of its proper divisors (28160097699496).

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

21533500201304 is a wasteful number, since it uses less digits than its factorization.

21533500201304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538792 (or 538788 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21533500201304 its reverse (40310200533512), we get a palindrome (61843700734816).

The spelling of 21533500201304 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred million, two hundred one thousand, three hundred four".