21111100010122 has 4 divisors (see below), whose sum is σ = 31666650015186. Its totient is φ = 10555550005060.

The previous prime is 21111100010111. The next prime is 21111100010159. The reversal of 21111100010122 is 22101000111112.

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., 16609366060681 + 4501733949441 = 4075459^2 + 2121729^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277775002529 + ... + 5277775002532.

Almost surely, 2^{21111100010122} is an apocalyptic number.

21111100010122 is a deficient number, since it is larger than the sum of its proper divisors (10555550005064).

21111100010122 is a wasteful number, since it uses less digits than its factorization.

21111100010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555550005063.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111100010122 its reverse (22101000111112), we get a palindrome (43212100121234).

The spelling of 21111100010122 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, ten thousand, one hundred twenty-two".