1118161421 has 8 divisors (see below), whose sum is σ = 1204434840. Its totient is φ = 1031925312.

The previous prime is 1118161397. The next prime is 1118161427. The reversal of 1118161421 is 1241618111.

It can be written as a sum of positive squares in 4 ways, for example, as 38316100 + 1079845321 = 6190^2 + 32861^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1118161421 - 2³⁰ = 44419597 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 (1118161427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103931 + ... + 114183.

It is an arithmetic number, because the mean of its divisors is an integer number (150554355).

Almost surely, 2^1118161421 is an apocalyptic number.

It is an amenable number.

1118161421 is a deficient number, since it is larger than the sum of its proper divisors (86273419).

1118161421 is a wasteful number, since it uses less digits than its factorization.

1118161421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18655.

The product of its digits is 384, while the sum is 26.

The square root of 1118161421 is about 33438.9207511247. The cubic root of 1118161421 is about 1037.9302465988.

Adding to 1118161421 its reverse (1241618111), we get a palindrome (2359779532).

The spelling of 1118161421 in words is "one billion, one hundred eighteen million, one hundred sixty-one thousand, four hundred twenty-one".