21140030040 has 96 divisors (see below), whose sum is σ = 66933805680. Its totient is φ = 5340628224.

The previous prime is 21140030039. The next prime is 21140030057. The reversal of 21140030040 is 4003004112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200679 + ... + 287318.

Almost surely, 2^21140030040 is an apocalyptic number.

21140030040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140030040 is an abundant number, since it is smaller than the sum of its proper divisors (45793775640).

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

21140030040 is a wasteful number, since it uses less digits than its factorization.

21140030040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488049 (or 488026 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21140030040 its reverse (4003004112), we get a palindrome (25143034152).

The spelling of 21140030040 in words is "twenty-one billion, one hundred forty million, thirty thousand, forty".