21431305602135 has 192 divisors, whose sum is σ = 45557631415296. Its totient is φ = 9170934220800.

The previous prime is 21431305602127. The next prime is 21431305602137. The reversal of 21431305602135 is 53120650313412.

21431305602135 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 1 + 30 + 5 + 602 + 13 + 5 = 666.

It is not a de Polignac number, because 21431305602135 - 2³ = 21431305602127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21431305602135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431305602137) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 387301420 + ... + 387356750.

It is an arithmetic number, because the mean of its divisors is an integer number (237279330288).

Almost surely, 2^{21431305602135} is an apocalyptic number.

21431305602135 is an abundant number, since it is smaller than the sum of its proper divisors (24126325813161).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431305602135 is a wasteful number, since it uses less digits than its factorization.

21431305602135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58006 (or 58003 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 21431305602135 its reverse (53120650313412), we get a palindrome (74551955915547).

The spelling of 21431305602135 in words is "twenty-one trillion, four hundred thirty-one billion, three hundred five million, six hundred two thousand, one hundred thirty-five".