21023330240 has 56 divisors (see below), whose sum is σ = 54612887472. Its totient is φ = 7644846080.

The previous prime is 21023330239. The next prime is 21023330243. The reversal of 21023330240 is 4203332012.

It is a super-3 number, since 3×21023330240³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023330243) 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, 2982749 + ... + 2989788.

Almost surely, 2^21023330240 is an apocalyptic number.

21023330240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023330240 is an abundant number, since it is smaller than the sum of its proper divisors (33589557232).

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

21023330240 is a wasteful number, since it uses less digits than its factorization.

21023330240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5972565 (or 5972555 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21023330240 its reverse (4203332012), we get a palindrome (25226662252).

The spelling of 21023330240 in words is "twenty-one billion, twenty-three million, three hundred thirty thousand, two hundred forty".