21160521331387 has 2 divisors, whose sum is σ = 21160521331388. Its totient is φ = 21160521331386.

The previous prime is 21160521331381. The next prime is 21160521331427. The reversal of 21160521331387 is 78313312506112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21160521331387 - 2⁷ = 21160521331259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21160521331381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580260665693 + 10580260665694.

It is an arithmetic number, because the mean of its divisors is an integer number (10580260665694).

Almost surely, 2^{21160521331387} is an apocalyptic number.

21160521331387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160521331387 is an equidigital number, since it uses as much as digits as its factorization.

21160521331387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

Adding to 21160521331387 its reverse (78313312506112), we get a palindrome (99473833837499).

The spelling of 21160521331387 in words is "twenty-one trillion, one hundred sixty billion, five hundred twenty-one million, three hundred thirty-one thousand, three hundred eighty-seven".