1211202111001 has 8 divisors (see below), whose sum is σ = 1233425269440. Its totient is φ = 1189035429648.

The previous prime is 1211202110999. The next prime is 1211202111029. The reversal of 1211202111001 is 1001112021121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1211202111001 - 2¹ = 1211202110999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211202111701) 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, 14075986 + ... + 14161771.

It is an arithmetic number, because the mean of its divisors is an integer number (154178158680).

Almost surely, 2^{1211202111001} is an apocalyptic number.

It is an amenable number.

1211202111001 is a deficient number, since it is larger than the sum of its proper divisors (22223158439).

1211202111001 is an equidigital number, since it uses as much as digits as its factorization.

1211202111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28238543.

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

Adding to 1211202111001 its reverse (1001112021121), we get a palindrome (2212314132122).

The spelling of 1211202111001 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred eleven thousand, one".