21534061086720 has 2304 divisors, whose sum is σ = 94068810501120. Its totient is φ = 4435627474944.

The previous prime is 21534061086677. The next prime is 21534061086737. The reversal of 21534061086720 is 2768016043512.

21534061086720 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 4 + 0 + 610 + 8 + 6 + 7 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 83790120832 + ... + 83790121088.

It is an arithmetic number, because the mean of its divisors is an integer number (40828476780).

Almost surely, 2^{21534061086720} is an apocalyptic number.

21534061086720 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 21534061086720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47034405250560).

21534061086720 is an abundant number, since it is smaller than the sum of its proper divisors (72534749414400).

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

21534061086720 is a wasteful number, since it uses less digits than its factorization.

21534061086720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 21534061086720 in words is "twenty-one trillion, five hundred thirty-four billion, sixty-one million, eighty-six thousand, seven hundred twenty".