21470065216331 has 4 divisors (see below), whose sum is σ = 21470094183912. Its totient is φ = 21470036248752.

The previous prime is 21470065216321. The next prime is 21470065216339. The reversal of 21470065216331 is 13361256007412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21470065216331 - 2¹⁸ = 21470064954187 is a prime.

It is a super-2 number, since 2×21470065216331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21470065216339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13342025 + ... + 14864378.

It is an arithmetic number, because the mean of its divisors is an integer number (5367523545978).

Almost surely, 2^{21470065216331} is an apocalyptic number.

21470065216331 is a deficient number, since it is larger than the sum of its proper divisors (28967581).

21470065216331 is an equidigital number, since it uses as much as digits as its factorization.

21470065216331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28967580.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 21470065216331 in words is "twenty-one trillion, four hundred seventy billion, sixty-five million, two hundred sixteen thousand, three hundred thirty-one".