216021054 has 16 divisors (see below), whose sum is σ = 432316800. Its totient is φ = 71961240.

The previous prime is 216021049. The next prime is 216021061. The reversal of 216021054 is 450120612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216021054.

It is a congruent number.

It is an unprimeable number.

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, 402 + ... + 20789.

It is an arithmetic number, because the mean of its divisors is an integer number (27019800).

Almost surely, 2^216021054 is an apocalyptic number.

216021054 is an abundant number, since it is smaller than the sum of its proper divisors (216295746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216021054 is a wasteful number, since it uses less digits than its factorization.

216021054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22895.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 216021054 is about 14697.6547108714. The cubic root of 216021054 is about 600.0194938111.

Adding to 216021054 its reverse (450120612), we get a palindrome (666141666).

The spelling of 216021054 in words is "two hundred sixteen million, twenty-one thousand, fifty-four".