216932421 has 8 divisors (see below), whose sum is σ = 293205760. Its totient is φ = 142640352.

The previous prime is 216932407. The next prime is 216932453. The reversal of 216932421 is 124239612.

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

It is not a de Polignac number, because 216932421 - 2⁶ = 216932357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216932621) 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, 495061 + ... + 495498.

It is an arithmetic number, because the mean of its divisors is an integer number (36650720).

Almost surely, 2^216932421 is an apocalyptic number.

It is an amenable number.

216932421 is a deficient number, since it is larger than the sum of its proper divisors (76273339).

216932421 is an equidigital number, since it uses as much as digits as its factorization.

216932421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990635.

The product of its digits is 5184, while the sum is 30.

The square root of 216932421 is about 14728.6259033217. The cubic root of 216932421 is about 600.8621134518.

The spelling of 216932421 in words is "two hundred sixteen million, nine hundred thirty-two thousand, four hundred twenty-one".