221010101858 has 90 divisors (see below), whose sum is σ = 419267660373. Its totient is φ = 87121419840.

The previous prime is 221010101843. The next prime is 221010101867. The reversal of 221010101858 is 858101010122.

221010101858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 70789519969 + 150220581889 = 266063^2 + 387583^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332423.

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 221010101858.

It is an unprimeable number.

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 44 ways as a sum of consecutive naturals, for example, 786512678 + ... + 786512958.

Almost surely, 2^221010101858 is an apocalyptic number.

221010101858 is a deficient number, since it is larger than the sum of its proper divisors (198257558515).

221010101858 is an frugal number, since it uses more digits than its factorization.

221010101858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 29.

The spelling of 221010101858 in words is "two hundred twenty-one billion, ten million, one hundred one thousand, eight hundred fifty-eight".