53421218 has 4 divisors (see below), whose sum is σ = 80131830. Its totient is φ = 26710608.

The previous prime is 53421209. The next prime is 53421239. The reversal of 53421218 is 81212435.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81212435 = 5 ⋅16242487.

It can be written as a sum of positive squares in only one way, i.e., 52954729 + 466489 = 7277^2 + 683^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13355303 + ... + 13355306.

Almost surely, 2^53421218 is an apocalyptic number.

53421218 is a deficient number, since it is larger than the sum of its proper divisors (26710612).

53421218 is a wasteful number, since it uses less digits than its factorization.

53421218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26710611.

The product of its digits is 1920, while the sum is 26.

The square root of 53421218 is about 7308.9820084605. The cubic root of 53421218 is about 376.6210546835.

The spelling of 53421218 in words is "fifty-three million, four hundred twenty-one thousand, two hundred eighteen".