21583104492 has 96 divisors (see below), whose sum is σ = 53558149120. Its totient is φ = 6745757760.

The previous prime is 21583104469. The next prime is 21583104547. The reversal of 21583104492 is 29440138512.

It is a super-4 number, since 4×21583104492⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21583104492.

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, 10070373 + ... + 10072515.

Almost surely, 2^21583104492 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 21583104492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26779074560).

21583104492 is an abundant number, since it is smaller than the sum of its proper divisors (31975044628).

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

21583104492 is a wasteful number, since it uses less digits than its factorization.

21583104492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603 (or 2601 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 21583104492 in words is "twenty-one billion, five hundred eighty-three million, one hundred four thousand, four hundred ninety-two".