20752421539 has 2 divisors, whose sum is σ = 20752421540. Its totient is φ = 20752421538.

The previous prime is 20752421513. The next prime is 20752421551. The reversal of 20752421539 is 93512425702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20752421539 - 2¹⁵ = 20752388771 is a prime.

It is a super-2 number, since 2×20752421539² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20752421939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10376210769 + 10376210770.

It is an arithmetic number, because the mean of its divisors is an integer number (10376210770).

Almost surely, 2^20752421539 is an apocalyptic number.

20752421539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20752421539 is an equidigital number, since it uses as much as digits as its factorization.

20752421539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 20752421539 in words is "twenty billion, seven hundred fifty-two million, four hundred twenty-one thousand, five hundred thirty-nine".