1001200121221 has 16 divisors (see below), whose sum is σ = 1006334935488. Its totient is φ = 996081408000.

The previous prime is 1001200121203. The next prime is 1001200121329. The reversal of 1001200121221 is 1221210021001.

1001200121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1001200121221 - 2⁷ = 1001200121093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001200521221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420494451 + ... + 420496831.

It is an arithmetic number, because the mean of its divisors is an integer number (62895933468).

Almost surely, 2^{1001200121221} is an apocalyptic number.

It is an amenable number.

1001200121221 is a deficient number, since it is larger than the sum of its proper divisors (5134814267).

1001200121221 is a wasteful number, since it uses less digits than its factorization.

1001200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001200121221 its reverse (1221210021001), we get a palindrome (2222410142222).

The spelling of 1001200121221 in words is "one trillion, one billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".