5551207221 has 8 divisors (see below), whose sum is σ = 8458982464. Its totient is φ = 3172118400.

The previous prime is 5551207201. The next prime is 5551207237. The reversal of 5551207221 is 1227021555.

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

It is not a de Polignac number, because 5551207221 - 2⁶ = 5551207157 is a prime.

It is a super-2 number, since 2×5551207221² = 61631803220965085682, which 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 (5551207201) 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, 132171580 + ... + 132171621.

It is an arithmetic number, because the mean of its divisors is an integer number (1057372808).

Almost surely, 2^5551207221 is an apocalyptic number.

It is an amenable number.

5551207221 is a deficient number, since it is larger than the sum of its proper divisors (2907775243).

5551207221 is a wasteful number, since it uses less digits than its factorization.

5551207221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264343211.

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 5551207221 is about 74506.4240250463. The cubic root of 5551207221 is about 1770.6354151976.

Adding to 5551207221 its reverse (1227021555), we get a palindrome (6778228776).

The spelling of 5551207221 in words is "five billion, five hundred fifty-one million, two hundred seven thousand, two hundred twenty-one".