21000022333 has 4 divisors (see below), whose sum is σ = 21052391868. Its totient is φ = 20947652800.

The previous prime is 21000022331. The next prime is 21000022339. The reversal of 21000022333 is 33322000012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19614842809 + 1385179524 = 140053^2 + 37218^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000022333 - 2¹ = 21000022331 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 (21000022331) 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, 26184166 + ... + 26184967.

It is an arithmetic number, because the mean of its divisors is an integer number (5263097967).

Almost surely, 2^21000022333 is an apocalyptic number.

It is an amenable number.

21000022333 is a deficient number, since it is larger than the sum of its proper divisors (52369535).

21000022333 is an equidigital number, since it uses as much as digits as its factorization.

21000022333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52369534.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21000022333 its reverse (33322000012), we get a palindrome (54322022345).

The spelling of 21000022333 in words is "twenty-one billion, twenty-two thousand, three hundred thirty-three".