211121204402 has 16 divisors (see below), whose sum is σ = 317796048024. Its totient is φ = 105189840000.

The previous prime is 211121204381. The next prime is 211121204407. The reversal of 211121204402 is 204402121112.

It can be written as a sum of positive squares in 4 ways, for example, as 209673325801 + 1447878601 = 457901^2 + 38051^2 .

It is not an unprimeable number, because it can be changed into a prime (211121204407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487952 + ... + 812612.

Almost surely, 2^211121204402 is an apocalyptic number.

211121204402 is a deficient number, since it is larger than the sum of its proper divisors (106674843622).

211121204402 is a wasteful number, since it uses less digits than its factorization.

211121204402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325805.

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

Adding to 211121204402 its reverse (204402121112), we get a palindrome (415523325514).

The spelling of 211121204402 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred four thousand, four hundred two".