18121122211202 has 4 divisors (see below), whose sum is σ = 27181683316806. Its totient is φ = 9060561105600.

The previous prime is 18121122211151. The next prime is 18121122211261. The reversal of 18121122211202 is 20211222112181.

It is a happy number.

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., 16863514723441 + 1257607487761 = 4106521^2 + 1121431^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4530280552799 + ... + 4530280552802.

Almost surely, 2^{18121122211202} is an apocalyptic number.

18121122211202 is a deficient number, since it is larger than the sum of its proper divisors (9060561105604).

18121122211202 is an equidigital number, since it uses as much as digits as its factorization.

18121122211202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060561105603.

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 18121122211202 its reverse (20211222112181), we get a palindrome (38332344323383).

The spelling of 18121122211202 in words is "eighteen trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred two".