21250635064055 has 32 divisors (see below), whose sum is σ = 26733384737280. Its totient is φ = 16197430487040.

The previous prime is 21250635064037. The next prime is 21250635064069. The reversal of 21250635064055 is 55046053605212.

It is not a de Polignac number, because 21250635064055 - 2⁸ = 21250635063799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21250635063997 and 21250635064015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91472 + ... + 6519941.

It is an arithmetic number, because the mean of its divisors is an integer number (835418273040).

Almost surely, 2^{21250635064055} is an apocalyptic number.

21250635064055 is a deficient number, since it is larger than the sum of its proper divisors (5482749673225).

21250635064055 is a wasteful number, since it uses less digits than its factorization.

21250635064055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611771.

The product of its (nonzero) digits is 1080000, while the sum is 44.

Adding to 21250635064055 its reverse (55046053605212), we get a palindrome (76296688669267).

The spelling of 21250635064055 in words is "twenty-one trillion, two hundred fifty billion, six hundred thirty-five million, sixty-four thousand, fifty-five".