21040358240 has 48 divisors (see below), whose sum is σ = 54226746000. Its totient is φ = 7651038720.

The previous prime is 21040358221. The next prime is 21040358243. The reversal of 21040358240 is 4285304012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040358243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5975615 + ... + 5979134.

It is an arithmetic number, because the mean of its divisors is an integer number (1129723875).

Almost surely, 2^21040358240 is an apocalyptic number.

21040358240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040358240 is an abundant number, since it is smaller than the sum of its proper divisors (33186387760).

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

21040358240 is a wasteful number, since it uses less digits than its factorization.

21040358240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11954775 (or 11954767 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 21040358240 in words is "twenty-one billion, forty million, three hundred fifty-eight thousand, two hundred forty".