55153221 has 8 divisors (see below), whose sum is σ = 73750944. Its totient is φ = 36662160.

The previous prime is 55153213. The next prime is 55153229. The reversal of 55153221 is 12235155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55153213) and next prime (55153229).

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

It is not a de Polignac number, because 55153221 - 2³ = 55153213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55153191 and 55153200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55153229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25450 + ... + 27531.

It is an arithmetic number, because the mean of its divisors is an integer number (9218868).

Almost surely, 2^55153221 is an apocalyptic number.

It is an amenable number.

55153221 is a deficient number, since it is larger than the sum of its proper divisors (18597723).

55153221 is a wasteful number, since it uses less digits than its factorization.

55153221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53331.

The product of its digits is 1500, while the sum is 24.

The square root of 55153221 is about 7426.5214602800. The cubic root of 55153221 is about 380.6480654215.

Adding to 55153221 its reverse (12235155), we get a palindrome (67388376).

The spelling of 55153221 in words is "fifty-five million, one hundred fifty-three thousand, two hundred twenty-one".