21073049280 has 336 divisors, whose sum is σ = 73890835200. Its totient is φ = 5511407616.

The previous prime is 21073049279. The next prime is 21073049287. The reversal of 21073049280 is 8294037012.

21073049280 is a `hidden beast` number, since 21 + 0 + 73 + 0 + 492 + 80 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21073049287) 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, 47568739 + ... + 47569181.

It is an arithmetic number, because the mean of its divisors is an integer number (219913200).

Almost surely, 2^21073049280 is an apocalyptic number.

21073049280 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 21073049280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36945417600).

21073049280 is an abundant number, since it is smaller than the sum of its proper divisors (52817785920).

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

21073049280 is a wasteful number, since it uses less digits than its factorization.

21073049280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21073049280 in words is "twenty-one billion, seventy-three million, forty-nine thousand, two hundred eighty".