20432121129 has 112 divisors (see below), whose sum is σ = 36603083520. Its totient is φ = 11153116800.

The previous prime is 20432121119. The next prime is 20432121163. The reversal of 20432121129 is 92112123402.

It is not a de Polignac number, because 20432121129 - 2⁴ = 20432121113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20432121119) 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 111 ways as a sum of consecutive naturals, for example, 14946004 + ... + 14947370.

Almost surely, 2^20432121129 is an apocalyptic number.

20432121129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20432121129 is a deficient number, since it is larger than the sum of its proper divisors (16170962391).

20432121129 is a wasteful number, since it uses less digits than its factorization.

20432121129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 20432121129 in words is "twenty billion, four hundred thirty-two million, one hundred twenty-one thousand, one hundred twenty-nine".