21113233020 has 144 divisors (see below), whose sum is σ = 69932509920. Its totient is φ = 5113459200.

The previous prime is 21113233007. The next prime is 21113233061. The reversal of 21113233020 is 2033231112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21113232984 and 21113233002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2333866 + ... + 2342894.

It is an arithmetic number, because the mean of its divisors is an integer number (485642430).

Almost surely, 2^21113233020 is an apocalyptic number.

21113233020 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 21113233020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34966254960).

21113233020 is an abundant number, since it is smaller than the sum of its proper divisors (48819276900).

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

21113233020 is a wasteful number, since it uses less digits than its factorization.

21113233020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236 (or 10231 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21113233020 its reverse (2033231112), we get a palindrome (23146464132).

It can be divided in two parts, 211 and 13233020, that added together give a palindrome (13233231).

The spelling of 21113233020 in words is "twenty-one billion, one hundred thirteen million, two hundred thirty-three thousand, twenty".