121211121001 has 4 divisors (see below), whose sum is σ = 121214034900. Its totient is φ = 121208207104.

The previous prime is 121211120959. The next prime is 121211121011. The reversal of 121211121001 is 100121112121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100121112121 = 1787 ⋅56027483.

It can be written as a sum of positive squares in 2 ways, for example, as 66594963600 + 54616157401 = 258060^2 + 233701^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211121001 - 2¹⁷ = 121210989929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211121011) 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, 1393636 + ... + 1478053.

It is an arithmetic number, because the mean of its divisors is an integer number (30303508725).

Almost surely, 2^121211121001 is an apocalyptic number.

It is an amenable number.

121211121001 is a deficient number, since it is larger than the sum of its proper divisors (2913899).

121211121001 is an equidigital number, since it uses as much as digits as its factorization.

121211121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913898.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121211121001 its reverse (100121112121), we get a palindrome (221332233122).

The spelling of 121211121001 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one".