21454497360 has 480 divisors, whose sum is σ = 77553036288. Its totient is φ = 5305098240.

The previous prime is 21454497353. The next prime is 21454497401. The reversal of 21454497360 is 6379445412.

21454497360 is a `hidden beast` number, since 2 + 14 + 544 + 97 + 3 + 6 + 0 = 666.

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 95 ways as a sum of consecutive naturals, for example, 68544564 + ... + 68544876.

Almost surely, 2^21454497360 is an apocalyptic number.

21454497360 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 21454497360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38776518144).

21454497360 is an abundant number, since it is smaller than the sum of its proper divisors (56098538928).

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

21454497360 is a wasteful number, since it uses less digits than its factorization.

21454497360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 21454497360 in words is "twenty-one billion, four hundred fifty-four million, four hundred ninety-seven thousand, three hundred sixty".