21421323333 has 12 divisors (see below), whose sum is σ = 30944616300. Its totient is φ = 14279633856.

The previous prime is 21421323317. The next prime is 21421323347. The reversal of 21421323333 is 33332312412.

21421323333 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 1 + 323 + 333 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15268803489 + 6152519844 = 123567^2 + 78438^2 .

It is not a de Polignac number, because 21421323333 - 2⁴ = 21421323317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21421323297 and 21421323306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421323533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11385 + ... + 207297.

It is an arithmetic number, because the mean of its divisors is an integer number (2578718025).

Almost surely, 2^21421323333 is an apocalyptic number.

It is an amenable number.

21421323333 is a deficient number, since it is larger than the sum of its proper divisors (9523292967).

21421323333 is a wasteful number, since it uses less digits than its factorization.

21421323333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208068 (or 208065 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

Adding to 21421323333 its reverse (33332312412), we get a palindrome (54753635745).

The spelling of 21421323333 in words is "twenty-one billion, four hundred twenty-one million, three hundred twenty-three thousand, three hundred thirty-three".