21420243333 has 12 divisors (see below), whose sum is σ = 30941715168. Its totient is φ = 14279532840.

The previous prime is 21420243323. The next prime is 21420243379. The reversal of 21420243333 is 33334202412.

21420243333 is a `hidden beast` number, since 21 + 4 + 202 + 433 + 3 + 3 = 666.

It is not a de Polignac number, because 21420243333 - 2⁸ = 21420243077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21420243297 and 21420243306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420243323) 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, 262866 + ... + 334572.

It is an arithmetic number, because the mean of its divisors is an integer number (2578476264).

Almost surely, 2^21420243333 is an apocalyptic number.

It is an amenable number.

21420243333 is a deficient number, since it is larger than the sum of its proper divisors (9521471835).

21420243333 is a wasteful number, since it uses less digits than its factorization.

21420243333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104904 (or 104901 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21420243333 its reverse (33334202412), we get a palindrome (54754445745).

The spelling of 21420243333 in words is "twenty-one billion, four hundred twenty million, two hundred forty-three thousand, three hundred thirty-three".