55251263346221 has 4 divisors (see below), whose sum is σ = 55269184615392. Its totient is φ = 55233342077052.

The previous prime is 55251263346199. The next prime is 55251263346239. The reversal of 55251263346221 is 12264336215255.

55251263346221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55251263346221 - 2³⁸ = 54976385439277 is a prime.

It is a super-2 number, since 2×55251263346221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55251263345221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8960629961 + ... + 8960636126.

It is an arithmetic number, because the mean of its divisors is an integer number (13817296153848).

Almost surely, 2^{55251263346221} is an apocalyptic number.

It is an amenable number.

55251263346221 is a deficient number, since it is larger than the sum of its proper divisors (17921269171).

55251263346221 is a wasteful number, since it uses less digits than its factorization.

55251263346221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921269170.

The product of its digits is 2592000, while the sum is 47.

The spelling of 55251263346221 in words is "fifty-five trillion, two hundred fifty-one billion, two hundred sixty-three million, three hundred forty-six thousand, two hundred twenty-one".