20210528291 has 2 divisors, whose sum is σ = 20210528292. Its totient is φ = 20210528290.

The previous prime is 20210528257. The next prime is 20210528309. The reversal of 20210528291 is 19282501202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210528291 is a prime.

It is a super-2 number, since 2×20210528291² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20210528491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105264145 + 10105264146.

It is an arithmetic number, because the mean of its divisors is an integer number (10105264146).

Almost surely, 2^20210528291 is an apocalyptic number.

20210528291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210528291 is an equidigital number, since it uses as much as digits as its factorization.

20210528291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 20210528291 in words is "twenty billion, two hundred ten million, five hundred twenty-eight thousand, two hundred ninety-one".