21102222020 has 48 divisors (see below), whose sum is σ = 49162680000. Its totient is φ = 7543470720.

The previous prime is 21102222017. The next prime is 21102222061. The reversal of 21102222020 is 2022220112.

It is a junction number, because it is equal to n+sod(n) for n = 21102221986 and 21102222004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799895 + ... + 825854.

It is an arithmetic number, because the mean of its divisors is an integer number (1024222500).

Almost surely, 2^21102222020 is an apocalyptic number.

21102222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102222020 is an abundant number, since it is smaller than the sum of its proper divisors (28060457980).

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

21102222020 is a wasteful number, since it uses less digits than its factorization.

21102222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625828 (or 1625826 counting only the distinct ones).

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

Adding to 21102222020 its reverse (2022220112), we get a palindrome (23124442132).

The spelling of 21102222020 in words is "twenty-one billion, one hundred two million, two hundred twenty-two thousand, twenty".