1001200021121 has 4 divisors (see below), whose sum is σ = 1007919484500. Its totient is φ = 994480557744.

The previous prime is 1001200021043. The next prime is 1001200021127. The reversal of 1001200021121 is 1211200021001.

1001200021121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 219984450625 + 781215570496 = 469025^2 + 883864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001200021121 - 2²² = 1001195826817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001200021127) 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, 3359731466 + ... + 3359731763.

It is an arithmetic number, because the mean of its divisors is an integer number (251979871125).

Almost surely, 2^{1001200021121} is an apocalyptic number.

It is an amenable number.

1001200021121 is a deficient number, since it is larger than the sum of its proper divisors (6719463379).

1001200021121 is an equidigital number, since it uses as much as digits as its factorization.

1001200021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6719463378.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001200021121 its reverse (1211200021001), we get a palindrome (2212400042122).

The spelling of 1001200021121 in words is "one trillion, one billion, two hundred million, twenty-one thousand, one hundred twenty-one".