21370678068528 has 720 divisors, whose sum is σ = 64683166369536. Its totient is φ = 6580828800000.

The previous prime is 21370678068511. The next prime is 21370678068581. The reversal of 21370678068528 is 82586087607312.

21370678068528 is a `hidden beast` number, since 2 + 1 + 37 + 0 + 6 + 78 + 0 + 6 + 8 + 528 = 666.

It is a super-2 number, since 2×21370678068528² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 101282834343 + ... + 101282834553.

Almost surely, 2^{21370678068528} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21370678068528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32341583184768).

21370678068528 is an abundant number, since it is smaller than the sum of its proper divisors (43312488301008).

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

21370678068528 is a wasteful number, since it uses less digits than its factorization.

21370678068528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 21370678068528 in words is "twenty-one trillion, three hundred seventy billion, six hundred seventy-eight million, sixty-eight thousand, five hundred twenty-eight".