12011210122221 has 24 divisors (see below), whose sum is σ = 17519526105536. Its totient is φ = 7929025536960.

The previous prime is 12011210122169. The next prime is 12011210122337. The reversal of 12011210122221 is 12222101211021.

12011210122221 is a `hidden beast` number, since 1 + 201 + 121 + 0 + 122 + 221 = 666.

It is not a de Polignac number, because 12011210122221 - 2⁹ = 12011210121709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011210122194 and 12011210122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011210121221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9953586 + ... + 11094876.

Almost surely, 2^{12011210122221} is an apocalyptic number.

It is an amenable number.

12011210122221 is a deficient number, since it is larger than the sum of its proper divisors (5508315983315).

12011210122221 is a wasteful number, since it uses less digits than its factorization.

12011210122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152753 (or 1152750 counting only the distinct ones).

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

Adding to 12011210122221 its reverse (12222101211021), we get a palindrome (24233311333242).

The spelling of 12011210122221 in words is "twelve trillion, eleven billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".