2021221221122 has 4 divisors (see below), whose sum is σ = 3031831831686. Its totient is φ = 1010610610560.

The previous prime is 2021221221079. The next prime is 2021221221157. The reversal of 2021221221122 is 2211221221202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1305994125601 + 715227095521 = 1142801^2 + 845711^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021221221094 and 2021221221103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505305305279 + ... + 505305305282.

Almost surely, 2^{2021221221122} is an apocalyptic number.

2021221221122 is a deficient number, since it is larger than the sum of its proper divisors (1010610610564).

2021221221122 is a wasteful number, since it uses less digits than its factorization.

2021221221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010610610563.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2021221221122 its reverse (2211221221202), we get a palindrome (4232442442324).

The spelling of 2021221221122 in words is "two trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".