21302122020 has 48 divisors (see below), whose sum is σ = 59683055040. Its totient is φ = 5677031296.

The previous prime is 21302122019. The next prime is 21302122027. The reversal of 21302122020 is 2022120312.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21302122027) by changing a digit.

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, 12507 + ... + 206786.

It is an arithmetic number, because the mean of its divisors is an integer number (1243396980).

Almost surely, 2^21302122020 is an apocalyptic number.

21302122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302122020 is an abundant number, since it is smaller than the sum of its proper divisors (38380933020).

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

21302122020 is a wasteful number, since it uses less digits than its factorization.

21302122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220924 (or 220922 counting only the distinct ones).

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

Adding to 21302122020 its reverse (2022120312), we get a palindrome (23324242332).

The spelling of 21302122020 in words is "twenty-one billion, three hundred two million, one hundred twenty-two thousand, twenty".