20331121011 has 16 divisors (see below), whose sum is σ = 27576690816. Its totient is φ = 13321129536.

The previous prime is 20331121001. The next prime is 20331121043. The reversal of 20331121011 is 11012113302.

It is a happy number.

It is not a de Polignac number, because 20331121011 - 2⁷ = 20331120883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20331121001) 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 15 ways as a sum of consecutive naturals, for example, 102045 + ... + 225998.

It is an arithmetic number, because the mean of its divisors is an integer number (1723543176).

Almost surely, 2^20331121011 is an apocalyptic number.

20331121011 is a deficient number, since it is larger than the sum of its proper divisors (7245569805).

20331121011 is a wasteful number, since it uses less digits than its factorization.

20331121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328402.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20331121011 its reverse (11012113302), we get a palindrome (31343234313).

The spelling of 20331121011 in words is "twenty billion, three hundred thirty-one million, one hundred twenty-one thousand, eleven".