218769021 has 24 divisors (see below), whose sum is σ = 334181120. Its totient is φ = 137526336.

The previous prime is 218768969. The next prime is 218769029. The reversal of 218769021 is 120967812.

218769021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218769021 - 2¹¹ = 218766973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218769029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35265 + ... + 41001.

Almost surely, 2^218769021 is an apocalyptic number.

It is an amenable number.

218769021 is a deficient number, since it is larger than the sum of its proper divisors (115412099).

218769021 is a wasteful number, since it uses less digits than its factorization.

218769021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985 (or 5982 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 218769021 is about 14790.8424709345. The cubic root of 218769021 is about 602.5530296580.

The spelling of 218769021 in words is "two hundred eighteen million, seven hundred sixty-nine thousand, twenty-one".