20001000010121 has 24 divisors (see below), whose sum is σ = 22967224656264. Its totient is φ = 17310435609600.

The previous prime is 20001000010067. The next prime is 20001000010183. The reversal of 20001000010121 is 12101000010002.

It can be written as a sum of positive squares in 4 ways, for example, as 1097994496 + 19999902015625 = 33136^2 + 4472125^2 .

It is not a de Polignac number, because 20001000010121 - 2¹⁰ = 20001000009097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001000010099 and 20001000010108.

It is not an unprimeable number, because it can be changed into a prime (20001005010121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21513230 + ... + 22423671.

It is an arithmetic number, because the mean of its divisors is an integer number (956967694011).

Almost surely, 2^{20001000010121} is an apocalyptic number.

It is an amenable number.

20001000010121 is a deficient number, since it is larger than the sum of its proper divisors (2966224646143).

20001000010121 is a wasteful number, since it uses less digits than its factorization.

20001000010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43937049 (or 43937030 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20001000010121 its reverse (12101000010002), we get a palindrome (32102000020123).

The spelling of 20001000010121 in words is "twenty trillion, one billion, ten thousand, one hundred twenty-one".