21034591488 has 144 divisors (see below), whose sum is σ = 64907955840. Its totient is φ = 6706630656.

The previous prime is 21034591483. The next prime is 21034591519. The reversal of 21034591488 is 88419543012.

21034591488 is a `hidden beast` number, since 2 + 10 + 3 + 4 + 591 + 48 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034591483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92820 + ... + 225132.

Almost surely, 2^21034591488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034591488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32453977920).

21034591488 is an abundant number, since it is smaller than the sum of its proper divisors (43873364352).

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

21034591488 is a wasteful number, since it uses less digits than its factorization.

21034591488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132361 (or 132341 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 21034591488 in words is "twenty-one billion, thirty-four million, five hundred ninety-one thousand, four hundred eighty-eight".