1211122211001 has 8 divisors (see below), whose sum is σ = 1619158918080. Its totient is φ = 805250155632.

The previous prime is 1211122210993. The next prime is 1211122211003. The reversal of 1211122211001 is 1001122211121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211122211001 - 2³ = 1211122210993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211122211003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541161621 + ... + 541163858.

It is an arithmetic number, because the mean of its divisors is an integer number (202394864760).

Almost surely, 2^{1211122211001} is an apocalyptic number.

It is an amenable number.

1211122211001 is a deficient number, since it is larger than the sum of its proper divisors (408036707079).

1211122211001 is a wasteful number, since it uses less digits than its factorization.

1211122211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082325855.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211122211001 its reverse (1001122211121), we get a palindrome (2212244422122).

The spelling of 1211122211001 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, one".