21212132113170 has 32 divisors (see below), whose sum is σ = 56565685635840. Its totient is φ = 5656568563440.

The previous prime is 21212132113169. The next prime is 21212132113217. The reversal of 21212132113170 is 7131123121212.

21212132113170 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 21 + 321 + 1 + 317 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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, 39281725866 + ... + 39281726405.

It is an arithmetic number, because the mean of its divisors is an integer number (1767677676120).

Almost surely, 2^{21212132113170} is an apocalyptic number.

21212132113170 is an abundant number, since it is smaller than the sum of its proper divisors (35353553522670).

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

21212132113170 is a wasteful number, since it uses less digits than its factorization.

21212132113170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78563452287 (or 78563452281 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

Adding to 21212132113170 its reverse (7131123121212), we get a palindrome (28343255234382).

The spelling of 21212132113170 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty-two million, one hundred thirteen thousand, one hundred seventy".