220821806949 has 8 divisors (see below), whose sum is σ = 294431307552. Its totient is φ = 147213422160.

The previous prime is 220821806903. The next prime is 220821806951. The reversal of 220821806949 is 949608128022.

220821806949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 220821806949 - 2¹¹ = 220821804901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220821826949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470367 + ... + 814179.

It is an arithmetic number, because the mean of its divisors is an integer number (36803913444).

Almost surely, 2^220821806949 is an apocalyptic number.

It is an amenable number.

220821806949 is a deficient number, since it is larger than the sum of its proper divisors (73609500603).

220821806949 is a wasteful number, since it uses less digits than its factorization.

220821806949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557907.

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 220821806949 in words is "two hundred twenty billion, eight hundred twenty-one million, eight hundred six thousand, nine hundred forty-nine".