1087922221 has 4 divisors (see below), whose sum is σ = 1099138012. Its totient is φ = 1076706432.

The previous prime is 1087922219. The next prime is 1087922261. The reversal of 1087922221 is 1222297801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222297801 = 1823 ⋅670487.

It can be written as a sum of positive squares in 2 ways, for example, as 620757225 + 467164996 = 24915^2 + 21614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087922221 - 2¹ = 1087922219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087922201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5607750 + ... + 5607943.

It is an arithmetic number, because the mean of its divisors is an integer number (274784503).

Almost surely, 2^1087922221 is an apocalyptic number.

It is an amenable number.

1087922221 is a deficient number, since it is larger than the sum of its proper divisors (11215791).

1087922221 is an equidigital number, since it uses as much as digits as its factorization.

1087922221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11215790.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1087922221 is about 32983.6659727205. The cubic root of 1087922221 is about 1028.4881268911.

The spelling of 1087922221 in words is "one billion, eighty-seven million, nine hundred twenty-two thousand, two hundred twenty-one".