21494540160 has 512 divisors, whose sum is σ = 80196480000. Its totient is φ = 5432942592.

The previous prime is 21494540117. The next prime is 21494540167. The reversal of 21494540160 is 6104549412.

21494540160 is a `hidden beast` number, since 2 + 1 + 49 + 454 + 0 + 160 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494540167) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29565717 + ... + 29566443.

It is an arithmetic number, because the mean of its divisors is an integer number (156633750).

Almost surely, 2^21494540160 is an apocalyptic number.

21494540160 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 21494540160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40098240000).

21494540160 is an abundant number, since it is smaller than the sum of its proper divisors (58701939840).

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

21494540160 is a wasteful number, since it uses less digits than its factorization.

21494540160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21494540160 in words is "twenty-one billion, four hundred ninety-four million, five hundred forty thousand, one hundred sixty".