21531070760706 has 96 divisors (see below), whose sum is σ = 50506875095040. Its totient is φ = 6589648886400.

The previous prime is 21531070760699. The next prime is 21531070760707. The reversal of 21531070760706 is 60706707013512.

21531070760706 is a `hidden beast` number, since 2 + 1 + 5 + 31 + 0 + 7 + 0 + 7 + 607 + 0 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21531070760707) 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, 818378680 + ... + 818404988.

It is an arithmetic number, because the mean of its divisors is an integer number (526113282240).

Almost surely, 2^{21531070760706} is an apocalyptic number.

21531070760706 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21531070760706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25253437547520).

21531070760706 is an abundant number, since it is smaller than the sum of its proper divisors (28975804334334).

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

21531070760706 is a wasteful number, since it uses less digits than its factorization.

21531070760706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44832 (or 44829 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The spelling of 21531070760706 in words is "twenty-one trillion, five hundred thirty-one billion, seventy million, seven hundred sixty thousand, seven hundred six".