55212151321 has 4 divisors (see below), whose sum is σ = 55212646144. Its totient is φ = 55211656500.

The previous prime is 55212151307. The next prime is 55212151327. The reversal of 55212151321 is 12315121255.

It is a happy number.

55212151321 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55212151321 - 2²¹ = 55210054169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55212151321.

It is not an unprimeable number, because it can be changed into a prime (55212151327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7516 + ... + 332386.

It is an arithmetic number, because the mean of its divisors is an integer number (13803161536).

Almost surely, 2^55212151321 is an apocalyptic number.

It is an amenable number.

55212151321 is a deficient number, since it is larger than the sum of its proper divisors (494823).

55212151321 is a wasteful number, since it uses less digits than its factorization.

55212151321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494822.

The product of its digits is 3000, while the sum is 28.

Adding to 55212151321 its reverse (12315121255), we get a palindrome (67527272576).

The spelling of 55212151321 in words is "fifty-five billion, two hundred twelve million, one hundred fifty-one thousand, three hundred twenty-one".