21020113332331 has 4 divisors (see below), whose sum is σ = 22256590587192. Its totient is φ = 19783636077472.

The previous prime is 21020113332319. The next prime is 21020113332347. The reversal of 21020113332331 is 13323331102012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020113332331 - 2⁴³ = 12224020310123 is a prime.

It is a super-2 number, since 2×21020113332331² (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 = 21020113332296 and 21020113332305.

It is not an unprimeable number, because it can be changed into a prime (21020113339331) 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, 618238627405 + ... + 618238627438.

It is an arithmetic number, because the mean of its divisors is an integer number (5564147646798).

Almost surely, 2^{21020113332331} is an apocalyptic number.

21020113332331 is a deficient number, since it is larger than the sum of its proper divisors (1236477254861).

21020113332331 is a wasteful number, since it uses less digits than its factorization.

21020113332331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236477254860.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21020113332331 its reverse (13323331102012), we get a palindrome (34343444434343).

The spelling of 21020113332331 in words is "twenty-one trillion, twenty billion, one hundred thirteen million, three hundred thirty-two thousand, three hundred thirty-one".