21331323331 has 8 divisors (see below), whose sum is σ = 21458956464. Its totient is φ = 21203740320.

The previous prime is 21331323281. The next prime is 21331323337. The reversal of 21331323331 is 13332313312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21331323331 - 2²³ = 21322934723 is a prime.

It is a super-2 number, since 2×21331323331² (a number of 21 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 = 21331323296 and 21331323305.

It is not an unprimeable number, because it can be changed into a prime (21331323337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172041 + ... + 1190101.

It is an arithmetic number, because the mean of its divisors is an integer number (2682369558).

Almost surely, 2^21331323331 is an apocalyptic number.

21331323331 is a deficient number, since it is larger than the sum of its proper divisors (127633133).

21331323331 is a wasteful number, since it uses less digits than its factorization.

21331323331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25061.

The product of its digits is 2916, while the sum is 25.

Adding to 21331323331 its reverse (13332313312), we get a palindrome (34663636643).

The spelling of 21331323331 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-three thousand, three hundred thirty-one".