21250612225256 has 8 divisors (see below), whose sum is σ = 39844897922370. Its totient is φ = 10625306112624.

The previous prime is 21250612225211. The next prime is 21250612225343. The reversal of 21250612225256 is 65252221605212.

It can be written as a sum of positive squares in only one way, i.e., 18806186292100 + 2444425933156 = 4336610^2 + 1563466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328163264071 + ... + 1328163264086.

Almost surely, 2^{21250612225256} is an apocalyptic number.

It is an amenable number.

21250612225256 is a deficient number, since it is larger than the sum of its proper divisors (18594285697114).

21250612225256 is a wasteful number, since it uses less digits than its factorization.

21250612225256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2656326528163 (or 2656326528159 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 21250612225256 in words is "twenty-one trillion, two hundred fifty billion, six hundred twelve million, two hundred twenty-five thousand, two hundred fifty-six".