21031033001321 has 48 divisors (see below), whose sum is σ = 26695937437200. Its totient is φ = 16507658248704.

The previous prime is 21031033001299. The next prime is 21031033001333. The reversal of 21031033001321 is 12310033013012.

It can be written as a sum of positive squares in 8 ways, for example, as 239256961321 + 20791776040000 = 489139^2 + 4559800^2 .

It is not a de Polignac number, because 21031033001321 - 2⁴² = 16632986490217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031033001293 and 21031033001302.

It is not an unprimeable number, because it can be changed into a prime (21031033004321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7726715 + ... + 10087823.

It is an arithmetic number, because the mean of its divisors is an integer number (556165363275).

Almost surely, 2^{21031033001321} is an apocalyptic number.

It is an amenable number.

21031033001321 is a deficient number, since it is larger than the sum of its proper divisors (5664904435879).

21031033001321 is an equidigital number, since it uses as much as digits as its factorization.

21031033001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361211 (or 2361170 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21031033001321 its reverse (12310033013012), we get a palindrome (33341066014333).

The spelling of 21031033001321 in words is "twenty-one trillion, thirty-one billion, thirty-three million, one thousand, three hundred twenty-one".