1020001200121 has 4 divisors (see below), whose sum is σ = 1022424006244. Its totient is φ = 1017578394000.

The previous prime is 1020001200077. The next prime is 1020001200131. The reversal of 1020001200121 is 1210021000201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174861130896 + 845140069225 = 418164^2 + 919315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020001200121 - 2⁷ = 1020001199993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020001200098 and 1020001200107.

It is not an unprimeable number, because it can be changed into a prime (1020001200131) 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, 1211402430 + ... + 1211403271.

It is an arithmetic number, because the mean of its divisors is an integer number (255606001561).

Almost surely, 2^{1020001200121} is an apocalyptic number.

It is an amenable number.

1020001200121 is a deficient number, since it is larger than the sum of its proper divisors (2422806123).

1020001200121 is an equidigital number, since it uses as much as digits as its factorization.

1020001200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422806122.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1020001200121 its reverse (1210021000201), we get a palindrome (2230022200322).

The spelling of 1020001200121 in words is "one trillion, twenty billion, one million, two hundred thousand, one hundred twenty-one".