121211100423 has 36 divisors (see below), whose sum is σ = 208635165648. Its totient is φ = 67574122560.

The previous prime is 121211100421. The next prime is 121211100449. The reversal of 121211100423 is 324001112121.

121211100423 is a `hidden beast` number, since 1 + 21 + 211 + 10 + 0 + 423 = 666.

It is not a de Polignac number, because 121211100423 - 2¹ = 121211100421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211100396 and 121211100405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211100421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3333811 + ... + 3369972.

It is an arithmetic number, because the mean of its divisors is an integer number (5795421268).

Almost surely, 2^121211100423 is an apocalyptic number.

121211100423 is a deficient number, since it is larger than the sum of its proper divisors (87424065225).

121211100423 is a wasteful number, since it uses less digits than its factorization.

121211100423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703844 (or 6703834 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121211100423 its reverse (324001112121), we get a palindrome (445212212544).

The spelling of 121211100423 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thousand, four hundred twenty-three".