21120322020 has 72 divisors (see below), whose sum is σ = 68791915584. Its totient is φ = 4827501504.

The previous prime is 21120322019. The next prime is 21120322039. The reversal of 21120322020 is 2022302112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3588952 + ... + 3594831.

It is an arithmetic number, because the mean of its divisors is an integer number (955443272).

Almost surely, 2^21120322020 is an apocalyptic number.

21120322020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120322020 is an abundant number, since it is smaller than the sum of its proper divisors (47671593564).

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

21120322020 is a wasteful number, since it uses less digits than its factorization.

21120322020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183809 (or 7183800 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21120322020 its reverse (2022302112), we get a palindrome (23142624132).

The spelling of 21120322020 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-two thousand, twenty".