21558472535040 has 704 divisors, whose sum is σ = 80019636092928. Its totient is φ = 4851818496000.

The previous prime is 21558472534939. The next prime is 21558472535069. The reversal of 21558472535040 is 4053527485512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8023248577 + ... + 8023251263.

Almost surely, 2^{21558472535040} is an apocalyptic number.

21558472535040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21558472535040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40009818046464).

21558472535040 is an abundant number, since it is smaller than the sum of its proper divisors (58461163557888).

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

21558472535040 is a wasteful number, since it uses less digits than its factorization.

21558472535040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844 (or 3826 counting only the distinct ones).

The product of its (nonzero) digits is 6720000, while the sum is 51.

The spelling of 21558472535040 in words is "twenty-one trillion, five hundred fifty-eight billion, four hundred seventy-two million, five hundred thirty-five thousand, forty".