21120211121211 has 12 divisors (see below), whose sum is σ = 30526390463400. Its totient is φ = 14071178204160.

The previous prime is 21120211121203. The next prime is 21120211121231. The reversal of 21120211121211 is 11212111202112.

It is a happy number.

21120211121211 is a `hidden beast` number, since 2 + 1 + 120 + 211 + 121 + 211 = 666.

It is not a de Polignac number, because 21120211121211 - 2³ = 21120211121203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120211121231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 746863686 + ... + 746891963.

It is an arithmetic number, because the mean of its divisors is an integer number (2543865871950).

Almost surely, 2^{21120211121211} is an apocalyptic number.

21120211121211 is a deficient number, since it is larger than the sum of its proper divisors (9406179342189).

21120211121211 is a wasteful number, since it uses less digits than its factorization.

21120211121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493757226 (or 1493757223 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21120211121211 its reverse (11212111202112), we get a palindrome (32332322323323).

The spelling of 21120211121211 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, one hundred twenty-one thousand, two hundred eleven".