21331033020 has 96 divisors (see below), whose sum is σ = 72396253440. Its totient is φ = 5171158080.

The previous prime is 21331033019. The next prime is 21331033021. The reversal of 21331033020 is 2033013312.

21331033020 is a `hidden beast` number, since 2 + 1 + 3 + 310 + 330 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (21331033019) and next prime (21331033021).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21331032984 and 21331033002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331033021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1789602 + ... + 1801481.

It is an arithmetic number, because the mean of its divisors is an integer number (754127640).

Almost surely, 2^21331033020 is an apocalyptic number.

21331033020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331033020 is an abundant number, since it is smaller than the sum of its proper divisors (51065220420).

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

21331033020 is a wasteful number, since it uses less digits than its factorization.

21331033020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591112 (or 3591104 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21331033020 its reverse (2033013312), we get a palindrome (23364046332).

The spelling of 21331033020 in words is "twenty-one billion, three hundred thirty-one million, thirty-three thousand, twenty".