21533500201320 has 48 divisors (see below), whose sum is σ = 69983875655460. Its totient is φ = 5742266720256.

The previous prime is 21533500201313. The next prime is 21533500201379. The reversal of 21533500201320 is 2310200533512.

It is a happy number.

21533500201320 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 3 + 500 + 20 + 132 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20737768407876 + 795731793444 = 4553874^2 + 892038^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29907638809 + ... + 29907639528.

Almost surely, 2^{21533500201320} is an apocalyptic number.

21533500201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533500201320 is an abundant number, since it is smaller than the sum of its proper divisors (48450375454140).

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

21533500201320 is a wasteful number, since it uses less digits than its factorization.

21533500201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59815278354 (or 59815278347 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21533500201320 its reverse (2310200533512), we get a palindrome (23843700734832).

The spelling of 21533500201320 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred million, two hundred one thousand, three hundred twenty".