20003561277121 has 4 divisors (see below), whose sum is σ = 20873281332672. Its totient is φ = 19133841221572.

The previous prime is 20003561277107. The next prime is 20003561277149. The reversal of 20003561277121 is 12177216530002.

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 a de Polignac number, because none of the positive numbers 2^k-20003561277121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003561271121) 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 3 ways as a sum of consecutive naturals, for example, 434860027741 + ... + 434860027786.

It is an arithmetic number, because the mean of its divisors is an integer number (5218320333168).

Almost surely, 2^{20003561277121} is an apocalyptic number.

It is an amenable number.

20003561277121 is a deficient number, since it is larger than the sum of its proper divisors (869720055551).

20003561277121 is an equidigital number, since it uses as much as digits as its factorization.

20003561277121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869720055550.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 20003561277121 in words is "twenty trillion, three billion, five hundred sixty-one million, two hundred seventy-seven thousand, one hundred twenty-one".