2211212021121 has 128 divisors (see below), whose sum is σ = 3540983040000. Its totient is φ = 1376602356096.

The previous prime is 2211212021119. The next prime is 2211212021141. The reversal of 2211212021121 is 1211202121122.

2211212021121 is a `hidden beast` number, since 221 + 1 + 212 + 0 + 211 + 21 = 666.

It is not a de Polignac number, because 2211212021121 - 2¹ = 2211212021119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2211212021094 and 2211212021103.

It is not an unprimeable number, because it can be changed into a prime (2211212021141) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1549552210 + ... + 1549553636.

It is an arithmetic number, because the mean of its divisors is an integer number (27663930000).

Almost surely, 2^{2211212021121} is an apocalyptic number.

It is an amenable number.

2211212021121 is a deficient number, since it is larger than the sum of its proper divisors (1329771018879).

2211212021121 is an equidigital number, since it uses as much as digits as its factorization.

2211212021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975 (or 1957 counting only the distinct ones).

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

Adding to 2211212021121 its reverse (1211202121122), we get a palindrome (3422414142243).

The spelling of 2211212021121 in words is "two trillion, two hundred eleven billion, two hundred twelve million, twenty-one thousand, one hundred twenty-one".