21004558488 has 96 divisors (see below), whose sum is σ = 60300592560. Its totient is φ = 6582343680.

The previous prime is 21004558483. The next prime is 21004558489. The reversal of 21004558488 is 88485540012.

21004558488 is a `hidden beast` number, since 2 + 10 + 0 + 4 + 558 + 4 + 88 = 666.

It is a super-2 number, since 2×21004558488² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004558483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1150068 + ... + 1168188.

Almost surely, 2^21004558488 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 21004558488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30150296280).

21004558488 is an abundant number, since it is smaller than the sum of its proper divisors (39296034072).

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

21004558488 is a wasteful number, since it uses less digits than its factorization.

21004558488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19097 (or 19090 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 45.

The spelling of 21004558488 in words is "twenty-one billion, four million, five hundred fifty-eight thousand, four hundred eighty-eight".