21493162080 has 960 divisors, whose sum is σ = 87136378560. Its totient is φ = 4951425024.

The previous prime is 21493162069. The next prime is 21493162091. The reversal of 21493162080 is 8026139412.

21493162080 is a `hidden beast` number, since 2 + 1 + 493 + 162 + 0 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21493162069) and next prime (21493162091).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 258953719 + ... + 258953801.

It is an arithmetic number, because the mean of its divisors is an integer number (90767061).

Almost surely, 2^21493162080 is an apocalyptic number.

21493162080 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 21493162080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43568189280).

21493162080 is an abundant number, since it is smaller than the sum of its proper divisors (65643216480).

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

21493162080 is a wasteful number, since it uses less digits than its factorization.

21493162080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21493162080 in words is "twenty-one billion, four hundred ninety-three million, one hundred sixty-two thousand, eighty".