2118274821 has 20 divisors (see below), whose sum is σ = 3407748652. Its totient is φ = 1303553088.

The previous prime is 2118274771. The next prime is 2118274841. The reversal of 2118274821 is 1284728112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1260605025 + 857669796 = 35505^2 + 29286^2 .

It is not a de Polignac number, because 2118274821 - 2¹⁵ = 2118242053 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 (2118274841) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1004776 + ... + 1006881.

Almost surely, 2^2118274821 is an apocalyptic number.

It is an amenable number.

2118274821 is a deficient number, since it is larger than the sum of its proper divisors (1289473831).

2118274821 is a wasteful number, since it uses less digits than its factorization.

2118274821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011682 (or 2011673 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 2118274821 is about 46024.7196732365. The cubic root of 2118274821 is about 1284.2831009530.

The spelling of 2118274821 in words is "two billion, one hundred eighteen million, two hundred seventy-four thousand, eight hundred twenty-one".