20223021531 has 4 divisors (see below), whose sum is σ = 26964028712. Its totient is φ = 13482014352.

The previous prime is 20223021521. The next prime is 20223021541. The reversal of 20223021531 is 13512032202.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20223021521) and next prime (20223021541).

It is not a de Polignac number, because 20223021531 - 2⁹ = 20223021019 is a prime.

It is a super-2 number, since 2×20223021531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20223021498 and 20223021507.

It is not an unprimeable number, because it can be changed into a prime (20223021521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3370503586 + ... + 3370503591.

It is an arithmetic number, because the mean of its divisors is an integer number (6741007178).

Almost surely, 2^20223021531 is an apocalyptic number.

20223021531 is a deficient number, since it is larger than the sum of its proper divisors (6741007181).

20223021531 is an equidigital number, since it uses as much as digits as its factorization.

20223021531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6741007180.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20223021531 its reverse (13512032202), we get a palindrome (33735053733).

The spelling of 20223021531 in words is "twenty billion, two hundred twenty-three million, twenty-one thousand, five hundred thirty-one".