21252705725256 has 32 divisors (see below), whose sum is σ = 55928172962400. Its totient is φ = 6711380755200.

The previous prime is 21252705725243. The next prime is 21252705725257. The reversal of 21252705725256 is 65252750725212.

It is a junction number, because it is equal to n+sod(n) for n = 21252705725199 and 21252705725208.

It is not an unprimeable number, because it can be changed into a prime (21252705725257) 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 7 ways as a sum of consecutive naturals, for example, 23303404945 + ... + 23303405856.

It is an arithmetic number, because the mean of its divisors is an integer number (1747755405075).

Almost surely, 2^{21252705725256} is an apocalyptic number.

It is an amenable number.

21252705725256 is an abundant number, since it is smaller than the sum of its proper divisors (34675467237144).

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

21252705725256 is a wasteful number, since it uses less digits than its factorization.

21252705725256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46606810829 (or 46606810825 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 51.

The spelling of 21252705725256 in words is "twenty-one trillion, two hundred fifty-two billion, seven hundred five million, seven hundred twenty-five thousand, two hundred fifty-six".