21330332020 has 48 divisors (see below), whose sum is σ = 48004564608. Its totient is φ = 7940592000.

The previous prime is 21330332011. The next prime is 21330332029. The reversal of 21330332020 is 2023303312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21330332011) and next prime (21330332029).

It is a super-3 number, since 3×21330332020³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330332029) 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, 609606 + ... + 643645.

It is an arithmetic number, because the mean of its divisors is an integer number (1000095096).

Almost surely, 2^21330332020 is an apocalyptic number.

21330332020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330332020 is an abundant number, since it is smaller than the sum of its proper divisors (26674232588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21330332020 is a wasteful number, since it uses less digits than its factorization.

21330332020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253320 (or 1253318 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21330332020 its reverse (2023303312), we get a palindrome (23353635332).

The spelling of 21330332020 in words is "twenty-one billion, three hundred thirty million, three hundred thirty-two thousand, twenty".