21046589960 has 96 divisors (see below), whose sum is σ = 52146060120. Its totient is φ = 7639357440.

The previous prime is 21046589957. The next prime is 21046590001. The reversal of 21046589960 is 6998564012.

It can be written as a sum of positive squares in 4 ways, for example, as 11118858916 + 9927731044 = 105446^2 + 99638^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21046589899 and 21046589908.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2866454 + ... + 2873786.

Almost surely, 2^21046589960 is an apocalyptic number.

21046589960 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 21046589960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26073030060).

21046589960 is an abundant number, since it is smaller than the sum of its proper divisors (31099470160).

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

21046589960 is a wasteful number, since it uses less digits than its factorization.

21046589960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959 (or 7944 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 21046589960 in words is "twenty-one billion, forty-six million, five hundred eighty-nine thousand, nine hundred sixty".