55221207 has 8 divisors (see below), whose sum is σ = 74455920. Its totient is φ = 36400320.

The previous prime is 55221203. The next prime is 55221209. The reversal of 55221207 is 70212255.

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

It is not a de Polignac number, because 55221207 - 2² = 55221203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221203) 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, 103144 + ... + 103677.

It is an arithmetic number, because the mean of its divisors is an integer number (9306990).

Almost surely, 2^55221207 is an apocalyptic number.

55221207 is a deficient number, since it is larger than the sum of its proper divisors (19234713).

55221207 is a wasteful number, since it uses less digits than its factorization.

55221207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206913.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 55221207 is about 7431.0972944781. The cubic root of 55221207 is about 380.8044063255.

The spelling of 55221207 in words is "fifty-five million, two hundred twenty-one thousand, two hundred seven".