21835559040 has 256 divisors, whose sum is σ = 71740598400. Its totient is φ = 5646417920.

The previous prime is 21835559023. The next prime is 21835559071. The reversal of 21835559040 is 4095553812.

It is a junction number, because it is equal to n+sod(n) for n = 21835558983 and 21835559001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9055435 + ... + 9057845.

Almost surely, 2^21835559040 is an apocalyptic number.

21835559040 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 21835559040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35870299200).

21835559040 is an abundant number, since it is smaller than the sum of its proper divisors (49905039360).

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

21835559040 is a wasteful number, since it uses less digits than its factorization.

21835559040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2563 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 21835559040 in words is "twenty-one billion, eight hundred thirty-five million, five hundred fifty-nine thousand, forty".