1201121211001 has 4 divisors (see below), whose sum is σ = 1201143789712. Its totient is φ = 1201098632292.

The previous prime is 1201121210963. The next prime is 1201121211019. The reversal of 1201121211001 is 1001121211021.

It is a happy number.

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 1201121211001 - 2⁹ = 1201121210489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201121214001) 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, 11209371 + ... + 11316016.

It is an arithmetic number, because the mean of its divisors is an integer number (300285947428).

Almost surely, 2^{1201121211001} is an apocalyptic number.

It is an amenable number.

1201121211001 is a deficient number, since it is larger than the sum of its proper divisors (22578711).

1201121211001 is an equidigital number, since it uses as much as digits as its factorization.

1201121211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22578710.

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

Adding to 1201121211001 its reverse (1001121211021), we get a palindrome (2202242422022).

The spelling of 1201121211001 in words is "one trillion, two hundred one billion, one hundred twenty-one million, two hundred eleven thousand, one".