21131212332123 has 12 divisors (see below), whose sum is σ = 30523628892328. Its totient is φ = 14087121056640.

The previous prime is 21131212332121. The next prime is 21131212332127. The reversal of 21131212332123 is 32123321213112.

21131212332123 is a `hidden beast` number, since 2 + 1 + 1 + 312 + 1 + 2 + 3 + 321 + 23 = 666.

It is not a de Polignac number, because 21131212332123 - 2¹ = 21131212332121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131212332121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29107465 + ... + 29824602.

Almost surely, 2^{21131212332123} is an apocalyptic number.

21131212332123 is a deficient number, since it is larger than the sum of its proper divisors (9392416560205).

21131212332123 is a wasteful number, since it uses less digits than its factorization.

21131212332123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58971914 (or 58971911 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 21131212332123 its reverse (32123321213112), we get a palindrome (53254533545235).

The spelling of 21131212332123 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twelve million, three hundred thirty-two thousand, one hundred twenty-three".