21073057488 has 240 divisors, whose sum is σ = 69751059456. Its totient is φ = 5811886080.

The previous prime is 21073057483. The next prime is 21073057619. The reversal of 21073057488 is 88475037012.

21073057488 is a `hidden beast` number, since 2 + 1 + 0 + 73 + 0 + 574 + 8 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073057483) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19279470 + ... + 19280562.

Almost surely, 2^21073057488 is an apocalyptic number.

21073057488 is a gapful number since it is divisible by the number (28) 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 21073057488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34875529728).

21073057488 is an abundant number, since it is smaller than the sum of its proper divisors (48678001968).

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

21073057488 is a wasteful number, since it uses less digits than its factorization.

21073057488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 21073057488 in words is "twenty-one billion, seventy-three million, fifty-seven thousand, four hundred eighty-eight".