1221210201211 has 48 divisors (see below), whose sum is σ = 1668447393984. Its totient is φ = 869695200000.

The previous prime is 1221210201203. The next prime is 1221210201227. The reversal of 1221210201211 is 1121020121221.

It is not a de Polignac number, because 1221210201211 - 2³ = 1221210201203 is a prime.

It is a super-2 number, since 2×1221210201211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221210201251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 563061 + ... + 1661161.

It is an arithmetic number, because the mean of its divisors is an integer number (34759320708).

Almost surely, 2^{1221210201211} is an apocalyptic number.

1221210201211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221210201211 is a deficient number, since it is larger than the sum of its proper divisors (447237192773).

1221210201211 is a wasteful number, since it uses less digits than its factorization.

1221210201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098244 (or 1098233 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221210201211 its reverse (1121020121221), we get a palindrome (2342230322432).

The spelling of 1221210201211 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred one thousand, two hundred eleven".