221200738877 has 4 divisors (see below), whose sum is σ = 221223644796. Its totient is φ = 221177832960.

The previous prime is 221200738861. The next prime is 221200738883. The reversal of 221200738877 is 778837002122.

221200738877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 19589476 + 221181149401 = 4426^2 + 470299^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200738877 - 2⁴ = 221200738861 is a prime.

It is a super-2 number, since 2×221200738877² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200738897) 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 3 ways as a sum of consecutive naturals, for example, 11438468 + ... + 11457789.

It is an arithmetic number, because the mean of its divisors is an integer number (55305911199).

Almost surely, 2^221200738877 is an apocalyptic number.

It is an amenable number.

221200738877 is a deficient number, since it is larger than the sum of its proper divisors (22905919).

221200738877 is an equidigital number, since it uses as much as digits as its factorization.

221200738877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22905918.

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 221200738877 in words is "two hundred twenty-one billion, two hundred million, seven hundred thirty-eight thousand, eight hundred seventy-seven".