55010221 has 8 divisors (see below), whose sum is σ = 62919104. Its totient is φ = 47113920.

The previous prime is 55010203. The next prime is 55010251. The reversal of 55010221 is 12201055.

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

It is not a de Polignac number, because 55010221 - 2⁷ = 55010093 is a prime.

It is a super-2 number, since 2×55010221² = 6052248828937682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55010195 and 55010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55010251) 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, 9781 + ... + 14341.

It is an arithmetic number, because the mean of its divisors is an integer number (7864888).

Almost surely, 2^55010221 is an apocalyptic number.

It is an amenable number.

55010221 is a deficient number, since it is larger than the sum of its proper divisors (7908883).

55010221 is a wasteful number, since it uses less digits than its factorization.

55010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6291.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 55010221 is about 7416.8875547631. The cubic root of 55010221 is about 380.3188021789.

Adding to 55010221 its reverse (12201055), we get a palindrome (67211276).

The spelling of 55010221 in words is "fifty-five million, ten thousand, two hundred twenty-one".