21033312020 has 24 divisors (see below), whose sum is σ = 50479949184. Its totient is φ = 7211421216.

The previous prime is 21033312011. The next prime is 21033312023. The reversal of 21033312020 is 2021333012.

It is a self number, because there is not a number n which added to its sum of digits gives 21033312020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033312023) 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, 75118832 + ... + 75119111.

It is an arithmetic number, because the mean of its divisors is an integer number (2103331216).

Almost surely, 2^21033312020 is an apocalyptic number.

21033312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033312020 is an abundant number, since it is smaller than the sum of its proper divisors (29446637164).

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

21033312020 is a wasteful number, since it uses less digits than its factorization.

21033312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150237959 (or 150237957 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21033312020 its reverse (2021333012), we get a palindrome (23054645032).

The spelling of 21033312020 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, twenty".