21473262720 has 768 divisors, whose sum is σ = 92707130880. Its totient is φ = 4459069440.

The previous prime is 21473262719. The next prime is 21473262779. The reversal of 21473262720 is 2726237412.

It is a happy number.

21473262720 is a `hidden beast` number, since 2 + 1 + 4 + 7 + 3 + 2 + 627 + 20 = 666.

It is a super-2 number, since 2×21473262720² (a number of 21 digits) contains 22 as substring.

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

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, 37215072 + ... + 37215648.

It is an arithmetic number, because the mean of its divisors is an integer number (120712410).

Almost surely, 2^21473262720 is an apocalyptic number.

21473262720 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 21473262720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46353565440).

21473262720 is an abundant number, since it is smaller than the sum of its proper divisors (71233868160).

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

21473262720 is a wasteful number, since it uses less digits than its factorization.

21473262720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 21473262720 in words is "twenty-one billion, four hundred seventy-three million, two hundred sixty-two thousand, seven hundred twenty".