1001220232121 has 4 divisors (see below), whose sum is σ = 1001255245200. Its totient is φ = 1001185219044.

The previous prime is 1001220232069. The next prime is 1001220232163. The reversal of 1001220232121 is 1212320221001.

1001220232121 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, 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-1001220232121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001220232121.

It is not an unprimeable number, because it can be changed into a prime (1001220252121) 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, 17463611 + ... + 17520848.

It is an arithmetic number, because the mean of its divisors is an integer number (250313811300).

Almost surely, 2^{1001220232121} is an apocalyptic number.

It is an amenable number.

1001220232121 is a deficient number, since it is larger than the sum of its proper divisors (35013079).

1001220232121 is an equidigital number, since it uses as much as digits as its factorization.

1001220232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35013078.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1001220232121 its reverse (1212320221001), we get a palindrome (2213540453122).

The spelling of 1001220232121 in words is "one trillion, one billion, two hundred twenty million, two hundred thirty-two thousand, one hundred twenty-one".