21031200032321 has 16 divisors (see below), whose sum is σ = 22154228088960. Its totient is φ = 19909789320960.

The previous prime is 21031200032287. The next prime is 21031200032341. The reversal of 21031200032321 is 12323000213012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031200032321 is a prime.

It is a super-2 number, since 2×21031200032321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031200032293 and 21031200032302.

It is not an unprimeable number, because it can be changed into a prime (21031200032341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155942300 + ... + 156077106.

It is an arithmetic number, because the mean of its divisors is an integer number (1384639255560).

Almost surely, 2^{21031200032321} is an apocalyptic number.

It is an amenable number.

21031200032321 is a deficient number, since it is larger than the sum of its proper divisors (1123028056639).

21031200032321 is a wasteful number, since it uses less digits than its factorization.

21031200032321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140744.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21031200032321 its reverse (12323000213012), we get a palindrome (33354200245333).

The spelling of 21031200032321 in words is "twenty-one trillion, thirty-one billion, two hundred million, thirty-two thousand, three hundred twenty-one".