20160521291 has 2 divisors, whose sum is σ = 20160521292. Its totient is φ = 20160521290.

The previous prime is 20160521287. The next prime is 20160521321. The reversal of 20160521291 is 19212506102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20160521291 - 2² = 20160521287 is a prime.

It is not a weakly prime, because it can be changed into another prime (20160521201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080260645 + 10080260646.

It is an arithmetic number, because the mean of its divisors is an integer number (10080260646).

Almost surely, 2^20160521291 is an apocalyptic number.

20160521291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20160521291 is an equidigital number, since it uses as much as digits as its factorization.

20160521291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 20160521291 in words is "twenty billion, one hundred sixty million, five hundred twenty-one thousand, two hundred ninety-one".