21022303020 has 96 divisors (see below), whose sum is σ = 62415976896. Its totient is φ = 5268480000.

The previous prime is 21022303013. The next prime is 21022303033. The reversal of 21022303020 is 2030322012.

It is a super-2 number, since 2×21022303020² (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 an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 700320 + ... + 729720.

It is an arithmetic number, because the mean of its divisors is an integer number (650166426).

Almost surely, 2^21022303020 is an apocalyptic number.

21022303020 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 21022303020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31207988448).

21022303020 is an abundant number, since it is smaller than the sum of its proper divisors (41393673876).

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

21022303020 is a wasteful number, since it uses less digits than its factorization.

21022303020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30131 (or 30129 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21022303020 its reverse (2030322012), we get a palindrome (23052625032).

The spelling of 21022303020 in words is "twenty-one billion, twenty-two million, three hundred three thousand, twenty".