20321121021 has 16 divisors (see below), whose sum is σ = 27380808000. Its totient is φ = 13404492288.

The previous prime is 20321121013. The next prime is 20321121049. The reversal of 20321121021 is 12012112302.

It is not a de Polignac number, because 20321121021 - 2³ = 20321121013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321121001) 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 in 15 ways as a sum of consecutive naturals, for example, 2037555 + ... + 2047503.

It is an arithmetic number, because the mean of its divisors is an integer number (1711300500).

Almost surely, 2^20321121021 is an apocalyptic number.

It is an amenable number.

20321121021 is a deficient number, since it is larger than the sum of its proper divisors (7059686979).

20321121021 is an equidigital number, since it uses as much as digits as its factorization.

20321121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17068.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20321121021 its reverse (12012112302), we get a palindrome (32333233323).

The spelling of 20321121021 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-one thousand, twenty-one".