1221213111201 has 24 divisors (see below), whose sum is σ = 1776256560000. Its totient is φ = 808476158112.

The previous prime is 1221213111193. The next prime is 1221213111253. The reversal of 1221213111201 is 1021113121221.

It is a happy number.

It is not a de Polignac number, because 1221213111201 - 2³ = 1221213111193 is a prime.

It is a super-2 number, since 2×1221213111201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221213211201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5358310 + ... + 5581568.

It is an arithmetic number, because the mean of its divisors is an integer number (74010690000).

Almost surely, 2^{1221213111201} is an apocalyptic number.

It is an amenable number.

1221213111201 is a deficient number, since it is larger than the sum of its proper divisors (555043448799).

1221213111201 is a wasteful number, since it uses less digits than its factorization.

1221213111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227493 (or 227490 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1221213111201 its reverse (1021113121221), we get a palindrome (2242326232422).

The spelling of 1221213111201 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, one hundred eleven thousand, two hundred one".