2021211122121 has 6 divisors (see below), whose sum is σ = 2919527176410. Its totient is φ = 1347474081408.

The previous prime is 2021211122101. The next prime is 2021211122171. The reversal of 2021211122121 is 1212211121202.

It can be written as a sum of positive squares in only one way, i.e., 1861259918400 + 159951203721 = 1364280^2 + 399939^2 .

It is not a de Polignac number, because 2021211122121 - 2¹⁴ = 2021211105737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021211122094 and 2021211122103.

It is not an unprimeable number, because it can be changed into a prime (2021211122101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112289506776 + ... + 112289506793.

It is an arithmetic number, because the mean of its divisors is an integer number (486587862735).

Almost surely, 2^{2021211122121} is an apocalyptic number.

It is an amenable number.

2021211122121 is a deficient number, since it is larger than the sum of its proper divisors (898316054289).

2021211122121 is a wasteful number, since it uses less digits than its factorization.

2021211122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224579013575 (or 224579013572 counting only the distinct ones).

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

Adding to 2021211122121 its reverse (1212211121202), we get a palindrome (3233422243323).

The spelling of 2021211122121 in words is "two trillion, twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".