2101211222121 has 48 divisors (see below), whose sum is σ = 3401352145152. Its totient is φ = 1249433396640.

The previous prime is 2101211222119. The next prime is 2101211222129. The reversal of 2101211222121 is 1212221121012.

2101211222121 is a `hidden beast` number, since 210 + 1 + 211 + 2 + 221 + 21 = 666.

It is not a de Polignac number, because 2101211222121 - 2¹ = 2101211222119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101211222094 and 2101211222103.

It is not an unprimeable number, because it can be changed into a prime (2101211222129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1019905 + ... + 2289678.

It is an arithmetic number, because the mean of its divisors is an integer number (70861503024).

Almost surely, 2^{2101211222121} is an apocalyptic number.

It is an amenable number.

2101211222121 is a deficient number, since it is larger than the sum of its proper divisors (1300140923031).

2101211222121 is a wasteful number, since it uses less digits than its factorization.

2101211222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309675 (or 3309650 counting only the distinct ones).

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

Adding to 2101211222121 its reverse (1212221121012), we get a palindrome (3313432343133).

The spelling of 2101211222121 in words is "two trillion, one hundred one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".