20321400129 has 4 divisors (see below), whose sum is σ = 27095200176. Its totient is φ = 13547600084.

The previous prime is 20321400101. The next prime is 20321400133. The reversal of 20321400129 is 92100412302.

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 20321400129 - 2⁸ = 20321399873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321400099 and 20321400108.

It is not an unprimeable number, because it can be changed into a prime (20321407129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3386900019 + ... + 3386900024.

It is an arithmetic number, because the mean of its divisors is an integer number (6773800044).

Almost surely, 2^20321400129 is an apocalyptic number.

It is an amenable number.

20321400129 is a deficient number, since it is larger than the sum of its proper divisors (6773800047).

20321400129 is an equidigital number, since it uses as much as digits as its factorization.

20321400129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773800046.

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 20321400129 in words is "twenty billion, three hundred twenty-one million, four hundred thousand, one hundred twenty-nine".