1221001132211 has 8 divisors (see below), whose sum is σ = 1414545343584. Its totient is φ = 1032235790400.

The previous prime is 1221001132201. The next prime is 1221001132213. The reversal of 1221001132211 is 1122311001221.

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 1221001132211 - 2¹⁴ = 1221001115827 is a prime.

It is a super-3 number, since 3×1221001132211³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221001132211.

It is not an unprimeable number, because it can be changed into a prime (1221001132213) 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, 1194716840 + ... + 1194717861.

It is an arithmetic number, because the mean of its divisors is an integer number (176818167948).

Almost surely, 2^{1221001132211} is an apocalyptic number.

1221001132211 is a deficient number, since it is larger than the sum of its proper divisors (193544211373).

1221001132211 is an equidigital number, since it uses as much as digits as its factorization.

1221001132211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389434781.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221001132211 its reverse (1122311001221), we get a palindrome (2343312133432).

The spelling of 1221001132211 in words is "one trillion, two hundred twenty-one billion, one million, one hundred thirty-two thousand, two hundred eleven".