21040231043040 has 96 divisors (see below), whose sum is σ = 72301884875136. Its totient is φ = 5100662069760.

The previous prime is 21040231042931. The next prime is 21040231043063. The reversal of 21040231043040 is 4034013204012.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21040231043040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1992440842 + ... + 1992451401.

It is an arithmetic number, because the mean of its divisors is an integer number (753144634116).

Almost surely, 2^{21040231043040} is an apocalyptic number.

21040231043040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040231043040 is an abundant number, since it is smaller than the sum of its proper divisors (51261653832096).

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

21040231043040 is a wasteful number, since it uses less digits than its factorization.

21040231043040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984892272 (or 3984892264 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21040231043040 its reverse (4034013204012), we get a palindrome (25074244247052).

The spelling of 21040231043040 in words is "twenty-one trillion, forty billion, two hundred thirty-one million, forty-three thousand, forty".