21599042488 has 8 divisors (see below), whose sum is σ = 40498204680. Its totient is φ = 10799521240.

The previous prime is 21599042431. The next prime is 21599042489. The reversal of 21599042488 is 88424099512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21599042489) 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 as a sum of consecutive naturals, namely, 1349940148 + ... + 1349940163.

It is an arithmetic number, because the mean of its divisors is an integer number (5062275585).

Almost surely, 2^21599042488 is an apocalyptic number.

It is an amenable number.

21599042488 is a deficient number, since it is larger than the sum of its proper divisors (18899162192).

21599042488 is a wasteful number, since it uses less digits than its factorization.

21599042488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699880317 (or 2699880313 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 21599042488 in words is "twenty-one billion, five hundred ninety-nine million, forty-two thousand, four hundred eighty-eight".