2018202421 has 4 divisors (see below), whose sum is σ = 2018361772. Its totient is φ = 2018043072.

The previous prime is 2018202391. The next prime is 2018202437. The reversal of 2018202421 is 1242028102.

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 624300196 + 1393902225 = 24986^2 + 37335^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018202421 - 2¹³ = 2018194229 is a prime.

It is a super-2 number, since 2×2018202421² = 8146282024260522482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2018202392 and 2018202401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018202451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58866 + ... + 86611.

It is an arithmetic number, because the mean of its divisors is an integer number (504590443).

Almost surely, 2^2018202421 is an apocalyptic number.

It is an amenable number.

2018202421 is a deficient number, since it is larger than the sum of its proper divisors (159351).

2018202421 is a wasteful number, since it uses less digits than its factorization.

2018202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159350.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 2018202421 is about 44924.4078536379. The cubic root of 2018202421 is about 1263.7317813105.

The spelling of 2018202421 in words is "two billion, eighteen million, two hundred two thousand, four hundred twenty-one".