1211211121001 has 16 divisors (see below), whose sum is σ = 1475158155264. Its totient is φ = 971914084944.

The previous prime is 1211211120979. The next prime is 1211211121033. The reversal of 1211211121001 is 1001211121121.

It is not a de Polignac number, because 1211211121001 - 2¹⁴ = 1211211104617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211211121091) 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, 80024885 + ... + 80040018.

It is an arithmetic number, because the mean of its divisors is an integer number (92197384704).

Almost surely, 2^{1211211121001} is an apocalyptic number.

It is an amenable number.

1211211121001 is a deficient number, since it is larger than the sum of its proper divisors (263947034263).

1211211121001 is a wasteful number, since it uses less digits than its factorization.

1211211121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160064980.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211211121001 its reverse (1001211121121), we get a palindrome (2212422242122).

The spelling of 1211211121001 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, one".