20300021531 has 2 divisors, whose sum is σ = 20300021532. Its totient is φ = 20300021530.

The previous prime is 20300021527. The next prime is 20300021549. The reversal of 20300021531 is 13512000302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20300021531 - 2² = 20300021527 is a prime.

It is a super-2 number, since 2×20300021531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20300021561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150010765 + 10150010766.

It is an arithmetic number, because the mean of its divisors is an integer number (10150010766).

Almost surely, 2^20300021531 is an apocalyptic number.

20300021531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20300021531 is an equidigital number, since it uses as much as digits as its factorization.

20300021531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 20300021531 its reverse (13512000302), we get a palindrome (33812021833).

The spelling of 20300021531 in words is "twenty billion, three hundred million, twenty-one thousand, five hundred thirty-one".