213666450 has 24 divisors (see below), whose sum is σ = 529893168. Its totient is φ = 56977680.

The previous prime is 213666449. The next prime is 213666463. The reversal of 213666450 is 54666312.

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 11 ways as a sum of consecutive naturals, for example, 712072 + ... + 712371.

It is an arithmetic number, because the mean of its divisors is an integer number (22078882).

Almost surely, 2^213666450 is an apocalyptic number.

213666450 is an abundant number, since it is smaller than the sum of its proper divisors (316226718).

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

213666450 is a wasteful number, since it uses less digits than its factorization.

213666450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424458 (or 1424453 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 213666450 is about 14617.3338882301. Note that the first 3 decimals coincide. The cubic root of 213666450 is about 597.8314775147.

It can be divided in two parts, 2136 and 66450, that added together give a palindrome (68586).

The spelling of 213666450 in words is "two hundred thirteen million, six hundred sixty-six thousand, four hundred fifty".