213216406 has 8 divisors (see below), whose sum is σ = 344426544. Its totient is φ = 98407560.

The previous prime is 213216391. The next prime is 213216413. The reversal of 213216406 is 604612312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×213216406² = 90922471575113672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100290 + ... + 4100341.

It is an arithmetic number, because the mean of its divisors is an integer number (43053318).

Almost surely, 2^213216406 is an apocalyptic number.

213216406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

213216406 is a deficient number, since it is larger than the sum of its proper divisors (131210138).

213216406 is a wasteful number, since it uses less digits than its factorization.

213216406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8200646.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 213216406 is about 14601.9315845541. The cubic root of 213216406 is about 597.4114465264.

Adding to 213216406 its reverse (604612312), we get a palindrome (817828718).

The spelling of 213216406 in words is "two hundred thirteen million, two hundred sixteen thousand, four hundred six".