10111122222121 has 8 divisors (see below), whose sum is σ = 10155767291720. Its totient is φ = 10066481428608.

The previous prime is 10111122222083. The next prime is 10111122222161. The reversal of 10111122222121 is 12122222111101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7255238538025 + 2855883684096 = 2693555^2 + 1689936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10111122222121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111122222161) 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, 3717775 + ... + 5834731.

It is an arithmetic number, because the mean of its divisors is an integer number (1269470911465).

Almost surely, 2^{10111122222121} is an apocalyptic number.

It is an amenable number.

10111122222121 is a deficient number, since it is larger than the sum of its proper divisors (44645069599).

10111122222121 is a wasteful number, since it uses less digits than its factorization.

10111122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138043.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 10111122222121 its reverse (12122222111101), we get a palindrome (22233344333222).

The spelling of 10111122222121 in words is "ten trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".