1001211220121 has 4 divisors (see below), whose sum is σ = 1144241394432. Its totient is φ = 858181045812.

The previous prime is 1001211220117. The next prime is 1001211220187. The reversal of 1001211220121 is 1210221121001.

1001211220121 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 not a de Polignac number, because 1001211220121 - 2² = 1001211220117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211220096 and 1001211220105.

It is not an unprimeable number, because it can be changed into a prime (1001211220721) 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, 71515087145 + ... + 71515087158.

It is an arithmetic number, because the mean of its divisors is an integer number (286060348608).

Almost surely, 2^{1001211220121} is an apocalyptic number.

It is an amenable number.

1001211220121 is a deficient number, since it is larger than the sum of its proper divisors (143030174311).

1001211220121 is an equidigital number, since it uses as much as digits as its factorization.

1001211220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143030174310.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001211220121 its reverse (1210221121001), we get a palindrome (2211432341122).

The spelling of 1001211220121 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-one".