21250561342105 has 16 divisors (see below), whose sum is σ = 25752686019840. Its totient is φ = 16832497635648.

The previous prime is 21250561342067. The next prime is 21250561342207. The reversal of 21250561342105 is 50124316505212.

It is a cyclic number.

It is not a de Polignac number, because 21250561342105 - 2⁹ = 21250561341593 is a prime.

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, 555525 + ... + 6542914.

It is an arithmetic number, because the mean of its divisors is an integer number (1609542876240).

Almost surely, 2^{21250561342105} is an apocalyptic number.

It is an amenable number.

21250561342105 is a deficient number, since it is larger than the sum of its proper divisors (4502124677735).

21250561342105 is a wasteful number, since it uses less digits than its factorization.

21250561342105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104360.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21250561342105 its reverse (50124316505212), we get a palindrome (71374877847317).

The spelling of 21250561342105 in words is "twenty-one trillion, two hundred fifty billion, five hundred sixty-one million, three hundred forty-two thousand, one hundred five".