20001213221029 has 4 divisors (see below), whose sum is σ = 20426770949184. Its totient is φ = 19575655492876.

The previous prime is 20001213220993. The next prime is 20001213221039. The reversal of 20001213221029 is 92012231210002.

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 20001213221029 - 2⁹ = 20001213220517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001213220994 and 20001213221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001213221039) 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, 212778864007 + ... + 212778864100.

It is an arithmetic number, because the mean of its divisors is an integer number (5106692737296).

Almost surely, 2^{20001213221029} is an apocalyptic number.

It is an amenable number.

20001213221029 is a deficient number, since it is larger than the sum of its proper divisors (425557728155).

20001213221029 is an equidigital number, since it uses as much as digits as its factorization.

20001213221029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425557728154.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 20001213221029 in words is "twenty trillion, one billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-nine".