55522007221 has 8 divisors (see below), whose sum is σ = 57338107904. Its totient is φ = 53707473360.

The previous prime is 55522007207. The next prime is 55522007231. The reversal of 55522007221 is 12270022555.

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

It is a cyclic number.

It is not a de Polignac number, because 55522007221 - 2¹⁷ = 55521876149 is a prime.

It is a super-2 number, since 2×55522007221² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55522007231) 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, 319461 + ... + 461626.

It is an arithmetic number, because the mean of its divisors is an integer number (7167263488).

Almost surely, 2^55522007221 is an apocalyptic number.

It is an amenable number.

55522007221 is a deficient number, since it is larger than the sum of its proper divisors (1816100683).

55522007221 is a wasteful number, since it uses less digits than its factorization.

55522007221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783411.

The product of its (nonzero) digits is 14000, while the sum is 31.

Adding to 55522007221 its reverse (12270022555), we get a palindrome (67792029776).

The spelling of 55522007221 in words is "fifty-five billion, five hundred twenty-two million, seven thousand, two hundred twenty-one".