21739072205052 has 36 divisors (see below), whose sum is σ = 54984508114536. Its totient is φ = 7242010436640.

The previous prime is 21739072204991. The next prime is 21739072205083. The reversal of 21739072205052 is 25050227093712.

21739072205052 is a `hidden beast` number, since 2 + 1 + 7 + 390 + 7 + 2 + 205 + 0 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21739072204989 and 21739072205007.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 181062699 + ... + 181182722.

It is an arithmetic number, because the mean of its divisors is an integer number (1527347447626).

Almost surely, 2^{21739072205052} is an apocalyptic number.

It is an amenable number.

21739072205052 is an abundant number, since it is smaller than the sum of its proper divisors (33245435909484).

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

21739072205052 is a wasteful number, since it uses less digits than its factorization.

21739072205052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362247098 (or 362247093 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

Adding to 21739072205052 its reverse (25050227093712), we get a palindrome (46789299298764).

The spelling of 21739072205052 in words is "twenty-one trillion, seven hundred thirty-nine billion, seventy-two million, two hundred five thousand, fifty-two".