21250225666366 has 16 divisors (see below), whose sum is σ = 32277560515200. Its totient is φ = 10491704208288.

The previous prime is 21250225666321. The next prime is 21250225666367. The reversal of 21250225666366 is 66366652205212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250225666367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166281006 + ... + 166408753.

It is an arithmetic number, because the mean of its divisors is an integer number (2017347532200).

Almost surely, 2^{21250225666366} is an apocalyptic number.

21250225666366 is a deficient number, since it is larger than the sum of its proper divisors (11027334848834).

21250225666366 is a wasteful number, since it uses less digits than its factorization.

21250225666366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332690163.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 21250225666366 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, three hundred sixty-six".