21235803580 has 12 divisors (see below), whose sum is σ = 44595187560. Its totient is φ = 8494321424.

The previous prime is 21235803559. The next prime is 21235803583. The reversal of 21235803580 is 8530853212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235803583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530895070 + ... + 530895109.

It is an arithmetic number, because the mean of its divisors is an integer number (3716265630).

Almost surely, 2^21235803580 is an apocalyptic number.

21235803580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21235803580 is an abundant number, since it is smaller than the sum of its proper divisors (23359383980).

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

21235803580 is a wasteful number, since it uses less digits than its factorization.

21235803580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061790188 (or 1061790186 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 21235803580 in words is "twenty-one billion, two hundred thirty-five million, eight hundred three thousand, five hundred eighty".