21233012020 has 24 divisors (see below), whose sum is σ = 48642900768. Its totient is φ = 7721095200.

The previous prime is 21233011967. The next prime is 21233012023. The reversal of 21233012020 is 2021033212.

It is a junction number, because it is equal to n+sod(n) for n = 21233011985 and 21233012003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233012023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48256626 + ... + 48257065.

It is an arithmetic number, because the mean of its divisors is an integer number (2026787532).

Almost surely, 2^21233012020 is an apocalyptic number.

21233012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233012020 is an abundant number, since it is smaller than the sum of its proper divisors (27409888748).

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

21233012020 is a wasteful number, since it uses less digits than its factorization.

21233012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96513711 (or 96513709 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21233012020 its reverse (2021033212), we get a palindrome (23254045232).

The spelling of 21233012020 in words is "twenty-one billion, two hundred thirty-three million, twelve thousand, twenty".