21221020103331 has 4 divisors (see below), whose sum is σ = 28294693471112. Its totient is φ = 14147346735552.

The previous prime is 21221020103317. The next prime is 21221020103357. The reversal of 21221020103331 is 13330102012212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21221020103331 - 2¹⁰ = 21221020102307 is a prime.

It is a super-3 number, since 3×21221020103331³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221020103298 and 21221020103307.

It is not an unprimeable number, because it can be changed into a prime (21221020103431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536836683886 + ... + 3536836683891.

It is an arithmetic number, because the mean of its divisors is an integer number (7073673367778).

Almost surely, 2^{21221020103331} is an apocalyptic number.

21221020103331 is a deficient number, since it is larger than the sum of its proper divisors (7073673367781).

21221020103331 is an equidigital number, since it uses as much as digits as its factorization.

21221020103331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073673367780.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21221020103331 its reverse (13330102012212), we get a palindrome (34551122115543).

The spelling of 21221020103331 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, one hundred three thousand, three hundred thirty-one".