21020120211020 has 24 divisors (see below), whose sum is σ = 50448288506784. Its totient is φ = 7206898358016.

The previous prime is 21020120210953. The next prime is 21020120211037. The reversal of 21020120211020 is 2011202102012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21020120210986 and 21020120211004.

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, 75071857757 + ... + 75071858036.

It is an arithmetic number, because the mean of its divisors is an integer number (2102012021116).

Almost surely, 2^{21020120211020} is an apocalyptic number.

21020120211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020120211020 is an abundant number, since it is smaller than the sum of its proper divisors (29428168295764).

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

21020120211020 is a wasteful number, since it uses less digits than its factorization.

21020120211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150143715809 (or 150143715807 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020120211020 its reverse (2011202102012), we get a palindrome (23031322313032).

The spelling of 21020120211020 in words is "twenty-one trillion, twenty billion, one hundred twenty million, two hundred eleven thousand, twenty".