21333200330021 has 4 divisors (see below), whose sum is σ = 21334477554432. Its totient is φ = 21331923105612.

The previous prime is 21333200329981. The next prime is 21333200330027. The reversal of 21333200330021 is 12003300233312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21333200330021 - 2²² = 21333196135717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333200330027) 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, 638587151 + ... + 638620556.

It is an arithmetic number, because the mean of its divisors is an integer number (5333619388608).

Almost surely, 2^{21333200330021} is an apocalyptic number.

It is an amenable number.

21333200330021 is a deficient number, since it is larger than the sum of its proper divisors (1277224411).

21333200330021 is a wasteful number, since it uses less digits than its factorization.

21333200330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277224410.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21333200330021 its reverse (12003300233312), we get a palindrome (33336500563333).

The spelling of 21333200330021 in words is "twenty-one trillion, three hundred thirty-three billion, two hundred million, three hundred thirty thousand, twenty-one".