21331434020 has 96 divisors (see below), whose sum is σ = 48604098816. Its totient is φ = 7817356800.

The previous prime is 21331434001. The next prime is 21331434031. The reversal of 21331434020 is 2043413312.

It is a super-2 number, since 2×21331434020² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26764262 + ... + 26765058.

It is an arithmetic number, because the mean of its divisors is an integer number (506292696).

Almost surely, 2^21331434020 is an apocalyptic number.

21331434020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21331434020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24302049408).

21331434020 is an abundant number, since it is smaller than the sum of its proper divisors (27272664796).

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

21331434020 is a wasteful number, since it uses less digits than its factorization.

21331434020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21331434020 its reverse (2043413312), we get a palindrome (23374847332).

The spelling of 21331434020 in words is "twenty-one billion, three hundred thirty-one million, four hundred thirty-four thousand, twenty".