201212211220111 has 24 divisors (see below), whose sum is σ = 249017407696224. Its totient is φ = 159193890011520.

The previous prime is 201212211220049. The next prime is 201212211220129. The reversal of 201212211220111 is 111022112212102.

It is a happy number.

It is not a de Polignac number, because 201212211220111 - 2⁷ = 201212211219983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212211229111) 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, 23346081 + ... + 30780901.

It is an arithmetic number, because the mean of its divisors is an integer number (10375725320676).

Almost surely, 2^{201212211220111} is an apocalyptic number.

201212211220111 is a deficient number, since it is larger than the sum of its proper divisors (47805196476113).

201212211220111 is a wasteful number, since it uses less digits than its factorization.

201212211220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7457731 (or 7457718 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201212211220111 its reverse (111022112212102), we get a palindrome (312234323432213).

The spelling of 201212211220111 in words is "two hundred one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, one hundred eleven".