4905122221 has 4 divisors (see below), whose sum is σ = 4920793852. Its totient is φ = 4889450592.

The previous prime is 4905122197. The next prime is 4905122249. The reversal of 4905122221 is 1222215094.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 662032900 + 4243089321 = 25730^2 + 65139^2 .

It is a cyclic number.

It is not a de Polignac number, because 4905122221 - 2¹⁹ = 4904597933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4905122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4905522221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7835346 + ... + 7835971.

It is an arithmetic number, because the mean of its divisors is an integer number (1230198463).

Almost surely, 2^4905122221 is an apocalyptic number.

It is an amenable number.

4905122221 is a deficient number, since it is larger than the sum of its proper divisors (15671631).

4905122221 is a wasteful number, since it uses less digits than its factorization.

4905122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15671630.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 4905122221 is about 70036.5777362087. The cubic root of 4905122221 is about 1699.0908888914.

The spelling of 4905122221 in words is "four billion, nine hundred five million, one hundred twenty-two thousand, two hundred twenty-one".