21212404232239 has 16 divisors (see below), whose sum is σ = 23160360960000. Its totient is φ = 19267709461920.

The previous prime is 21212404232237. The next prime is 21212404232269. The reversal of 21212404232239 is 93223240421212.

It is a cyclic number.

It is not a de Polignac number, because 21212404232239 - 2¹ = 21212404232237 is a prime.

It is a super-2 number, since 2×21212404232239² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212404232198 and 21212404232207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212404232231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185643577 + ... + 185757805.

It is an arithmetic number, because the mean of its divisors is an integer number (1447522560000).

Almost surely, 2^{21212404232239} is an apocalyptic number.

21212404232239 is a deficient number, since it is larger than the sum of its proper divisors (1947956727761).

21212404232239 is a wasteful number, since it uses less digits than its factorization.

21212404232239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128358.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 21212404232239 in words is "twenty-one trillion, two hundred twelve billion, four hundred four million, two hundred thirty-two thousand, two hundred thirty-nine".