211121122221021 has 16 divisors (see below), whose sum is σ = 298056021331968. Its totient is φ = 132466967424000.

The previous prime is 211121122221011. The next prime is 211121122221151. The reversal of 211121122221021 is 120122221121112.

It is not a de Polignac number, because 211121122221021 - 2¹⁵ = 211121122188253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121122221011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12796380 + ... + 24207221.

It is an arithmetic number, because the mean of its divisors is an integer number (18628501333248).

Almost surely, 2^{211121122221021} is an apocalyptic number.

It is an amenable number.

211121122221021 is a deficient number, since it is larger than the sum of its proper divisors (86934899110947).

211121122221021 is a wasteful number, since it uses less digits than its factorization.

211121122221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37115492.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211121122221021 its reverse (120122221121112), we get a palindrome (331243343342133).

The spelling of 211121122221021 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".