20210528491 has 2 divisors, whose sum is σ = 20210528492. Its totient is φ = 20210528490.

The previous prime is 20210528449. The next prime is 20210528567. The reversal of 20210528491 is 19482501202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20210528491 - 2⁷ = 20210528363 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210528291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105264245 + 10105264246.

It is an arithmetic number, because the mean of its divisors is an integer number (10105264246).

Almost surely, 2^20210528491 is an apocalyptic number.

20210528491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210528491 is an equidigital number, since it uses as much as digits as its factorization.

20210528491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 20210528491 in words is "twenty billion, two hundred ten million, five hundred twenty-eight thousand, four hundred ninety-one".