21321312201320 has 32 divisors (see below), whose sum is σ = 48030820986600. Its totient is φ = 8518237141248.

The previous prime is 21321312201289. The next prime is 21321312201377. The reversal of 21321312201320 is 2310221312312.

It can be written as a sum of positive squares in 4 ways, for example, as 14921393803684 + 6399918397636 = 3862822^2 + 2529806^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321458279 + ... + 321524598.

Almost surely, 2^{21321312201320} is an apocalyptic number.

21321312201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321312201320 is an abundant number, since it is smaller than the sum of its proper divisors (26709508785280).

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

21321312201320 is a wasteful number, since it uses less digits than its factorization.

21321312201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642983717 (or 642983713 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21321312201320 its reverse (2310221312312), we get a palindrome (23631533513632).

The spelling of 21321312201320 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twelve million, two hundred one thousand, three hundred twenty".