20430543121 has 4 divisors (see below), whose sum is σ = 20431649392. Its totient is φ = 20429436852.

The previous prime is 20430543113. The next prime is 20430543127. The reversal of 20430543121 is 12134503402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20430543121 - 2³ = 20430543113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430543127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524955 + ... + 562528.

It is an arithmetic number, because the mean of its divisors is an integer number (5107912348).

Almost surely, 2^20430543121 is an apocalyptic number.

It is an amenable number.

20430543121 is a deficient number, since it is larger than the sum of its proper divisors (1106271).

20430543121 is a wasteful number, since it uses less digits than its factorization.

20430543121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106270.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 20430543121 in words is "twenty billion, four hundred thirty million, five hundred forty-three thousand, one hundred twenty-one".