21206134024236 has 108 divisors (see below), whose sum is σ = 63615170474128. Its totient is φ = 6058895383008.

The previous prime is 21206134024223. The next prime is 21206134024261. The reversal of 21206134024236 is 63242043160212.

21206134024236 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 6 + 13 + 402 + 4 + 236 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21206134024236.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57533251 + ... + 57900666.

Almost surely, 2^{21206134024236} is an apocalyptic number.

It is an amenable number.

21206134024236 is an abundant number, since it is smaller than the sum of its proper divisors (42409036449892).

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

21206134024236 is an equidigital number, since it uses as much as digits as its factorization.

21206134024236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115433952 (or 115433929 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 21206134024236 its reverse (63242043160212), we get a palindrome (84448177184448).

The spelling of 21206134024236 in words is "twenty-one trillion, two hundred six billion, one hundred thirty-four million, twenty-four thousand, two hundred thirty-six".