21409196760 has 192 divisors, whose sum is σ = 80047918080. Its totient is φ = 4861036800.

The previous prime is 21409196717. The next prime is 21409196791. The reversal of 21409196760 is 6769190412.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 352389 + ... + 408651.

It is an arithmetic number, because the mean of its divisors is an integer number (416916240).

Almost surely, 2^21409196760 is an apocalyptic number.

21409196760 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 21409196760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40023959040).

21409196760 is an abundant number, since it is smaller than the sum of its proper divisors (58638721320).

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

21409196760 is a wasteful number, since it uses less digits than its factorization.

21409196760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56438 (or 56431 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 21409196760 in words is "twenty-one billion, four hundred nine million, one hundred ninety-six thousand, seven hundred sixty".