216903421 has 8 divisors (see below), whose sum is σ = 249323904. Its totient is φ = 184841520.

The previous prime is 216903419. The next prime is 216903439. The reversal of 216903421 is 124309612.

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

It is a cyclic number.

It is not a de Polignac number, because 216903421 - 2¹ = 216903419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216903421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216903461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88345 + ... + 90766.

It is an arithmetic number, because the mean of its divisors is an integer number (31165488).

Almost surely, 2^216903421 is an apocalyptic number.

It is an amenable number.

216903421 is a deficient number, since it is larger than the sum of its proper divisors (32420483).

216903421 is a wasteful number, since it uses less digits than its factorization.

216903421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179291.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 216903421 is about 14727.6413929726. The cubic root of 216903421 is about 600.8353374052.

The spelling of 216903421 in words is "two hundred sixteen million, nine hundred three thousand, four hundred twenty-one".