21033120020 has 24 divisors (see below), whose sum is σ = 48184966368. Its totient is φ = 7648407200.

The previous prime is 21033119993. The next prime is 21033120083. The reversal of 21033120020 is 2002133012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21033119977 and 21033120004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47802326 + ... + 47802765.

It is an arithmetic number, because the mean of its divisors is an integer number (2007706932).

Almost surely, 2^21033120020 is an apocalyptic number.

21033120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033120020 is an abundant number, since it is smaller than the sum of its proper divisors (27151846348).

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

21033120020 is a wasteful number, since it uses less digits than its factorization.

21033120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95605111 (or 95605109 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21033120020 its reverse (2002133012), we get a palindrome (23035253032).

The spelling of 21033120020 in words is "twenty-one billion, thirty-three million, one hundred twenty thousand, twenty".