10111211122221 has 40 divisors (see below), whose sum is σ = 16484350094784. Its totient is φ = 6125470058880.

The previous prime is 10111211122183. The next prime is 10111211122223. The reversal of 10111211122221 is 12222111211101.

It is a happy number.

10111211122221 is a `hidden beast` number, since 1 + 0 + 111 + 211 + 122 + 221 = 666.

It is not a de Polignac number, because 10111211122221 - 2⁶ = 10111211122157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10111211122194 and 10111211122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111211122223) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 194025 + ... + 4501118.

Almost surely, 2^{10111211122221} is an apocalyptic number.

10111211122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10111211122221 is a deficient number, since it is larger than the sum of its proper divisors (6373138972563).

10111211122221 is a wasteful number, since it uses less digits than its factorization.

10111211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697583 (or 4697574 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 10111211122221 its reverse (12222111211101), we get a palindrome (22333322333322).

The spelling of 10111211122221 in words is "ten trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".