21000102222020 has 24 divisors (see below), whose sum is σ = 44105484490200. Its totient is φ = 8399037112832.

The previous prime is 21000102222007. The next prime is 21000102222059. The reversal of 21000102222020 is 2022220100012.

It can be written as a sum of positive squares in 4 ways, for example, as 9759263536324 + 11240838685696 = 3123982^2 + 3352736^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21000102221986 and 21000102222004.

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, 62564435 + ... + 62899194.

It is an arithmetic number, because the mean of its divisors is an integer number (1837728520425).

Almost surely, 2^{21000102222020} is an apocalyptic number.

21000102222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000102222020 is an abundant number, since it is smaller than the sum of its proper divisors (23105382268180).

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

21000102222020 is a wasteful number, since it uses less digits than its factorization.

21000102222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125472007 (or 125472005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000102222020 its reverse (2022220100012), we get a palindrome (23022322322032).

The spelling of 21000102222020 in words is "twenty-one trillion, one hundred two million, two hundred twenty-two thousand, twenty".