55433431221 has 8 divisors (see below), whose sum is σ = 84469990464. Its totient is φ = 31676246400.

The previous prime is 55433431217. The next prime is 55433431223. The reversal of 55433431221 is 12213433455.

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

It is not a de Polignac number, because 55433431221 - 2² = 55433431217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55433431223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319843580 + ... + 1319843621.

It is an arithmetic number, because the mean of its divisors is an integer number (10558748808).

Almost surely, 2^55433431221 is an apocalyptic number.

It is an amenable number.

55433431221 is a deficient number, since it is larger than the sum of its proper divisors (29036559243).

55433431221 is a wasteful number, since it uses less digits than its factorization.

55433431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639687211.

The product of its digits is 43200, while the sum is 33.

Adding to 55433431221 its reverse (12213433455), we get a palindrome (67646864676).

The spelling of 55433431221 in words is "fifty-five billion, four hundred thirty-three million, four hundred thirty-one thousand, two hundred twenty-one".