21003140440 has 32 divisors (see below), whose sum is σ = 47333466000. Its totient is φ = 8387673984.

The previous prime is 21003140419. The next prime is 21003140443. The reversal of 21003140440 is 4404130012.

It is a super-2 number, since 2×21003140440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003140443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399375 + ... + 448894.

Almost surely, 2^21003140440 is an apocalyptic number.

21003140440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003140440 is an abundant number, since it is smaller than the sum of its proper divisors (26330325560).

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

21003140440 is a wasteful number, since it uses less digits than its factorization.

21003140440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848899 (or 848895 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21003140440 its reverse (4404130012), we get a palindrome (25407270452).

The spelling of 21003140440 in words is "twenty-one billion, three million, one hundred forty thousand, four hundred forty".