1211212220211 has 72 divisors (see below), whose sum is σ = 2040881098464. Its totient is φ = 690180503040.

The previous prime is 1211212220209. The next prime is 1211212220219. The reversal of 1211212220211 is 1120222121121.

1211212220211 is a `hidden beast` number, since 1 + 21 + 1 + 212 + 220 + 211 = 666.

It is not a de Polignac number, because 1211212220211 - 2¹ = 1211212220209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211212220219) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 334310146 + ... + 334313768.

It is an arithmetic number, because the mean of its divisors is an integer number (28345570812).

Almost surely, 2^{1211212220211} is an apocalyptic number.

1211212220211 is a deficient number, since it is larger than the sum of its proper divisors (829668878253).

1211212220211 is a wasteful number, since it uses less digits than its factorization.

1211212220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561 (or 5551 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211212220211 its reverse (1120222121121), we get a palindrome (2331434341332).

The spelling of 1211212220211 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred eleven".