21058423680 has 128 divisors (see below), whose sum is σ = 76712878080. Its totient is φ = 4813350912.

The previous prime is 21058423663. The next prime is 21058423681. The reversal of 21058423680 is 8632485012.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058423681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769984 + ... + 796863.

It is an arithmetic number, because the mean of its divisors is an integer number (599319360).

Almost surely, 2^21058423680 is an apocalyptic number.

21058423680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21058423680 is an abundant number, since it is smaller than the sum of its proper divisors (55654454400).

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

21058423680 is a wasteful number, since it uses less digits than its factorization.

21058423680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566876 (or 1566864 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 21058423680 in words is "twenty-one billion, fifty-eight million, four hundred twenty-three thousand, six hundred eighty".