11001212222121 has 40 divisors (see below), whose sum is σ = 18982483860384. Its totient is φ = 6275201258880.

The previous prime is 11001212222027. The next prime is 11001212222137. The reversal of 11001212222121 is 12122221210011.

11001212222121 is a `hidden beast` number, since 110 + 0 + 1 + 212 + 222 + 121 = 666.

It is not a de Polignac number, because 11001212222121 - 2⁹ = 11001212221609 is a prime.

It is a super-2 number, since 2×11001212222121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11001212222094 and 11001212222103.

It is not an unprimeable number, because it can be changed into a prime (11001212222521) 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, 363133075 + ... + 363163368.

Almost surely, 2^{11001212222121} is an apocalyptic number.

11001212222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001212222121 is a deficient number, since it is larger than the sum of its proper divisors (7981271638263).

11001212222121 is a wasteful number, since it uses less digits than its factorization.

11001212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726296483 (or 726296474 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11001212222121 its reverse (12122221210011), we get a palindrome (23123433432132).

The spelling of 11001212222121 in words is "eleven trillion, one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".