21250641433345 has 16 divisors (see below), whose sum is σ = 25580087470080. Its totient is φ = 16947649039104.

The previous prime is 21250641433321. The next prime is 21250641433361. The reversal of 21250641433345 is 54333414605212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250641433345 is a prime.

It is a super-2 number, since 2×21250641433345² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10964874 + ... + 12756556.

It is an arithmetic number, because the mean of its divisors is an integer number (1598755466880).

Almost surely, 2^{21250641433345} is an apocalyptic number.

It is an amenable number.

21250641433345 is a deficient number, since it is larger than the sum of its proper divisors (4329446036735).

21250641433345 is a wasteful number, since it uses less digits than its factorization.

21250641433345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799064.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 21250641433345 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred thirty-three thousand, three hundred forty-five".