55400232221 has 8 divisors (see below), whose sum is σ = 55674889920. Its totient is φ = 55125890272.

The previous prime is 55400232161. The next prime is 55400232229. The reversal of 55400232221 is 12223200455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55400232221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55400232229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276800 + ... + 432918.

It is an arithmetic number, because the mean of its divisors is an integer number (6959361240).

Almost surely, 2^55400232221 is an apocalyptic number.

It is an amenable number.

55400232221 is a deficient number, since it is larger than the sum of its proper divisors (274657699).

55400232221 is a wasteful number, since it uses less digits than its factorization.

55400232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157875.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 55400232221 its reverse (12223200455), we get a palindrome (67623432676).

The spelling of 55400232221 in words is "fifty-five billion, four hundred million, two hundred thirty-two thousand, two hundred twenty-one".