221620851848 has 36 divisors (see below), whose sum is σ = 456779774535. Its totient is φ = 100730093200.

The previous prime is 221620851833. The next prime is 221620851887. The reversal of 221620851848 is 848158026122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 110810425924 + 110810425924 = 332882^2 + 332882^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332882.

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 14639243 + ... + 14654373.

Almost surely, 2^221620851848 is an apocalyptic number.

It is an amenable number.

221620851848 is an abundant number, since it is smaller than the sum of its proper divisors (235158922687).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221620851848 is an frugal number, since it uses more digits than its factorization.

221620851848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30290 (or 15144 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 47.

The spelling of 221620851848 in words is "two hundred twenty-one billion, six hundred twenty million, eight hundred fifty-one thousand, eight hundred forty-eight".