21122032020 has 96 divisors (see below), whose sum is σ = 60167149056. Its totient is φ = 5535052800.

The previous prime is 21122031989. The next prime is 21122032027. The reversal of 21122032020 is 2023022112.

It is a happy number.

It is a super-2 number, since 2×21122032020² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122032027) 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 31 ways as a sum of consecutive naturals, for example, 5440480 + ... + 5444360.

It is an arithmetic number, because the mean of its divisors is an integer number (626741136).

Almost surely, 2^21122032020 is an apocalyptic number.

21122032020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122032020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30083574528).

21122032020 is an abundant number, since it is smaller than the sum of its proper divisors (39045117036).

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

21122032020 is a wasteful number, since it uses less digits than its factorization.

21122032020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441 (or 5439 counting only the distinct ones).

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

Adding to 21122032020 its reverse (2023022112), we get a palindrome (23145054132).

The spelling of 21122032020 in words is "twenty-one billion, one hundred twenty-two million, thirty-two thousand, twenty".