20423445332121 has 48 divisors (see below), whose sum is σ = 32100654719952. Its totient is φ = 12437514432000.

The previous prime is 20423445332117. The next prime is 20423445332159. The reversal of 20423445332121 is 12123354432402.

20423445332121 is a `hidden beast` number, since 2 + 0 + 42 + 3 + 44 + 533 + 21 + 21 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 51411027600 + 20372034304521 = 226740^2 + 4513539^2 .

It is not a de Polignac number, because 20423445332121 - 2² = 20423445332117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20423445332321) 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 in 47 ways as a sum of consecutive naturals, for example, 22876951 + ... + 23752931.

It is an arithmetic number, because the mean of its divisors is an integer number (668763639999).

Almost surely, 2^{20423445332121} is an apocalyptic number.

It is an amenable number.

20423445332121 is a deficient number, since it is larger than the sum of its proper divisors (11677209387831).

20423445332121 is a wasteful number, since it uses less digits than its factorization.

20423445332121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878074 (or 878071 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 20423445332121 its reverse (12123354432402), we get a palindrome (32546799764523).

The spelling of 20423445332121 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, three hundred thirty-two thousand, one hundred twenty-one".