21333311021 has 16 divisors (see below), whose sum is σ = 23396179968. Its totient is φ = 19291230000.

The previous prime is 21333311011. The next prime is 21333311039. The reversal of 21333311021 is 12011333312.

It is a cyclic number.

It is not a de Polignac number, because 21333311021 - 2¹⁰ = 21333309997 is a prime.

It is a super-2 number, since 2×21333311021² (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 = 21333310984 and 21333311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333311011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278676 + ... + 2288018.

It is an arithmetic number, because the mean of its divisors is an integer number (1462261248).

Almost surely, 2^21333311021 is an apocalyptic number.

It is an amenable number.

21333311021 is a deficient number, since it is larger than the sum of its proper divisors (2062868947).

21333311021 is a wasteful number, since it uses less digits than its factorization.

21333311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21333311021 its reverse (12011333312), we get a palindrome (33344644333).

The spelling of 21333311021 in words is "twenty-one billion, three hundred thirty-three million, three hundred eleven thousand, twenty-one".