21031201201320 has 48 divisors (see below), whose sum is σ = 68351403905460. Its totient is φ = 5608320320256.

The previous prime is 21031201201279. The next prime is 21031201201333. The reversal of 21031201201320 is 2310210213012.

21031201201320 is a `hidden beast` number, since 2 + 10 + 312 + 0 + 1 + 20 + 1 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19538645424516 + 1492555776804 = 4420254^2 + 1221702^2 .

It is a super-2 number, since 2×21031201201320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21031201201293 and 21031201201302.

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, 29210001309 + ... + 29210002028.

Almost surely, 2^{21031201201320} is an apocalyptic number.

21031201201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031201201320 is an abundant number, since it is smaller than the sum of its proper divisors (47320202704140).

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

21031201201320 is a wasteful number, since it uses less digits than its factorization.

21031201201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58420003354 (or 58420003347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21031201201320 its reverse (2310210213012), we get a palindrome (23341411414332).

The spelling of 21031201201320 in words is "twenty-one trillion, thirty-one billion, two hundred one million, two hundred one thousand, three hundred twenty".