55350042221 has 4 divisors (see below), whose sum is σ = 55716598944. Its totient is φ = 54983485500.

The previous prime is 55350042197. The next prime is 55350042233. The reversal of 55350042221 is 12224005355.

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 55350042221 - 2¹⁸ = 55349780077 is a prime.

It is a super-2 number, since 2×55350042221² (a number of 22 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 (55350041221) 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, 183278135 + ... + 183278436.

It is an arithmetic number, because the mean of its divisors is an integer number (13929149736).

Almost surely, 2^55350042221 is an apocalyptic number.

It is an amenable number.

55350042221 is a deficient number, since it is larger than the sum of its proper divisors (366556723).

55350042221 is a wasteful number, since it uses less digits than its factorization.

55350042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366556722.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 55350042221 its reverse (12224005355), we get a palindrome (67574047576).

The spelling of 55350042221 in words is "fifty-five billion, three hundred fifty million, forty-two thousand, two hundred twenty-one".