21435179460 has 96 divisors (see below), whose sum is σ = 63768176640. Its totient is φ = 5364563328.

The previous prime is 21435179443. The next prime is 21435179471. The reversal of 21435179460 is 6497153412.

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, 34117 + ... + 209843.

It is an arithmetic number, because the mean of its divisors is an integer number (664251840).

Almost surely, 2^21435179460 is an apocalyptic number.

21435179460 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 21435179460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31884088320).

21435179460 is an abundant number, since it is smaller than the sum of its proper divisors (42332997180).

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

21435179460 is a wasteful number, since it uses less digits than its factorization.

21435179460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175865 (or 175863 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21435179460 in words is "twenty-one billion, four hundred thirty-five million, one hundred seventy-nine thousand, four hundred sixty".