21023024490 has 96 divisors (see below), whose sum is σ = 58993670736. Its totient is φ = 5163540480.

The previous prime is 21023024479. The next prime is 21023024497. The reversal of 21023024490 is 9442032012.

21023024490 is a `hidden beast` number, since 210 + 2 + 3 + 0 + 2 + 449 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 535968801 + 20487055689 = 23151^2 + 143133^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21023024497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 519882 + ... + 558858.

Almost surely, 2^21023024490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023024490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29496835368).

21023024490 is an abundant number, since it is smaller than the sum of its proper divisors (37970646246).

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

21023024490 is a wasteful number, since it uses less digits than its factorization.

21023024490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39464 (or 39461 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21023024490 in words is "twenty-one billion, twenty-three million, twenty-four thousand, four hundred ninety".