21660546434331 has 32 divisors (see below), whose sum is σ = 33030511976448. Its totient is φ = 12368469565440.

The previous prime is 21660546434309. The next prime is 21660546434377. The reversal of 21660546434331 is 13343464506612.

It is not a de Polignac number, because 21660546434331 - 2⁵ = 21660546434299 is a prime.

It is a super-2 number, since 2×21660546434331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21660546435331) 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 31 ways as a sum of consecutive naturals, for example, 598984891 + ... + 599021051.

It is an arithmetic number, because the mean of its divisors is an integer number (1032203499264).

Almost surely, 2^{21660546434331} is an apocalyptic number.

21660546434331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21660546434331 is a deficient number, since it is larger than the sum of its proper divisors (11369965542117).

21660546434331 is a wasteful number, since it uses less digits than its factorization.

21660546434331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56091.

The product of its (nonzero) digits is 3732480, while the sum is 48.

The spelling of 21660546434331 in words is "twenty-one trillion, six hundred sixty billion, five hundred forty-six million, four hundred thirty-four thousand, three hundred thirty-one".