21041233240 has 16 divisors (see below), whose sum is σ = 47342774880. Its totient is φ = 8416493280.

The previous prime is 21041233237. The next prime is 21041233247. The reversal of 21041233240 is 4233214012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041233247) 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 3 ways as a sum of consecutive naturals, for example, 263015376 + ... + 263015455.

It is an arithmetic number, because the mean of its divisors is an integer number (2958923430).

Almost surely, 2^21041233240 is an apocalyptic number.

21041233240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041233240 is an abundant number, since it is smaller than the sum of its proper divisors (26301541640).

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

21041233240 is a wasteful number, since it uses less digits than its factorization.

21041233240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526030842 (or 526030838 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21041233240 its reverse (4233214012), we get a palindrome (25274447252).

The spelling of 21041233240 in words is "twenty-one billion, forty-one million, two hundred thirty-three thousand, two hundred forty".