21840153788 has 48 divisors (see below), whose sum is σ = 39188158464. Its totient is φ = 10647080640.

The previous prime is 21840153787. The next prime is 21840153833. The reversal of 21840153788 is 88735104812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840153787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24733595 + ... + 24734477.

It is an arithmetic number, because the mean of its divisors is an integer number (816419968).

Almost surely, 2^21840153788 is an apocalyptic number.

It is an amenable number.

21840153788 is a deficient number, since it is larger than the sum of its proper divisors (17348004676).

21840153788 is a wasteful number, since it uses less digits than its factorization.

21840153788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 21840153788 in words is "twenty-one billion, eight hundred forty million, one hundred fifty-three thousand, seven hundred eighty-eight".