21041440140424 has 32 divisors (see below), whose sum is σ = 43040268397440. Its totient is φ = 9564077857600.

The previous prime is 21041440140389. The next prime is 21041440140517. The reversal of 21041440140424 is 42404104414012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341834 + ... + 6624454.

It is an arithmetic number, because the mean of its divisors is an integer number (1345008387420).

Almost surely, 2^{21041440140424} is an apocalyptic number.

It is an amenable number.

21041440140424 is an abundant number, since it is smaller than the sum of its proper divisors (21998828257016).

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

21041440140424 is a wasteful number, since it uses less digits than its factorization.

21041440140424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327901 (or 5327897 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 21041440140424 its reverse (42404104414012), we get a palindrome (63445544554436).

The spelling of 21041440140424 in words is "twenty-one trillion, forty-one billion, four hundred forty million, one hundred forty thousand, four hundred twenty-four".