21002203301020 has 24 divisors (see below), whose sum is σ = 44105092441200. Its totient is φ = 8400792652032.

The previous prime is 21002203300963. The next prime is 21002203301021. The reversal of 21002203301020 is 2010330220012.

It is a junction number, because it is equal to n+sod(n) for n = 21002203300985 and 21002203301003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002203301021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3582610 + ... + 7405369.

It is an arithmetic number, because the mean of its divisors is an integer number (1837712185050).

Almost surely, 2^{21002203301020} is an apocalyptic number.

21002203301020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002203301020 is an abundant number, since it is smaller than the sum of its proper divisors (23102889140180).

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

21002203301020 is a wasteful number, since it uses less digits than its factorization.

21002203301020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11083557 (or 11083555 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002203301020 its reverse (2010330220012), we get a palindrome (23012533521032).

The spelling of 21002203301020 in words is "twenty-one trillion, two billion, two hundred three million, three hundred one thousand, twenty".