21002332040 has 16 divisors (see below), whose sum is σ = 47255247180. Its totient is φ = 8400932800.

The previous prime is 21002332031. The next prime is 21002332097. The reversal of 21002332040 is 4023320012.

It can be written as a sum of positive squares in 2 ways, for example, as 20271494884 + 730837156 = 142378^2 + 27034^2 .

It is a super-2 number, since 2×21002332040² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 262529111 + ... + 262529190.

Almost surely, 2^21002332040 is an apocalyptic number.

21002332040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002332040 is an abundant number, since it is smaller than the sum of its proper divisors (26252915140).

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

21002332040 is a wasteful number, since it uses less digits than its factorization.

21002332040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525058312 (or 525058308 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21002332040 its reverse (4023320012), we get a palindrome (25025652052).

The spelling of 21002332040 in words is "twenty-one billion, two million, three hundred thirty-two thousand, forty".