21297353885280 has 960 divisors, whose sum is σ = 83681865723456. Its totient is φ = 5057095680000.

The previous prime is 21297353885273. The next prime is 21297353885317. The reversal of 21297353885280 is 8258835379212.

21297353885280 is a `hidden beast` number, since 2 + 1 + 2 + 9 + 73 + 5 + 38 + 8 + 528 + 0 = 666.

It is a super-2 number, since 2×21297353885280² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5296529670 + ... + 5296533690.

Almost surely, 2^{21297353885280} is an apocalyptic number.

21297353885280 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 21297353885280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41840932861728).

21297353885280 is an abundant number, since it is smaller than the sum of its proper divisors (62384511838176).

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

21297353885280 is a wasteful number, since it uses less digits than its factorization.

21297353885280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 21297353885280 in words is "twenty-one trillion, two hundred ninety-seven billion, three hundred fifty-three million, eight hundred eighty-five thousand, two hundred eighty".