20021233129 has 4 divisors (see below), whose sum is σ = 20303222400. Its totient is φ = 19739243860.

The previous prime is 20021233073. The next prime is 20021233151. The reversal of 20021233129 is 92133212002.

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 20021233129 - 2²³ = 20012844521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021213129) 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, 140994529 + ... + 140994670.

It is an arithmetic number, because the mean of its divisors is an integer number (5075805600).

Almost surely, 2^20021233129 is an apocalyptic number.

It is an amenable number.

20021233129 is a deficient number, since it is larger than the sum of its proper divisors (281989271).

20021233129 is an equidigital number, since it uses as much as digits as its factorization.

20021233129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281989270.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 20021233129 in words is "twenty billion, twenty-one million, two hundred thirty-three thousand, one hundred twenty-nine".