216921119 has 16 divisors (see below), whose sum is σ = 244097280. Its totient is φ = 191759040.

The previous prime is 216921113. The next prime is 216921127. The reversal of 216921119 is 911129612.

It is a cyclic number.

It is not a de Polignac number, because 216921119 - 2¹² = 216917023 is a prime.

It is a super-2 number, since 2×216921119² = 94109543736424322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216921113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11864 + ... + 23970.

It is an arithmetic number, because the mean of its divisors is an integer number (15256080).

Almost surely, 2^216921119 is an apocalyptic number.

216921119 is a deficient number, since it is larger than the sum of its proper divisors (27176161).

216921119 is a wasteful number, since it uses less digits than its factorization.

216921119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190.

The product of its digits is 1944, while the sum is 32.

The square root of 216921119 is about 14728.2422237007. The cubic root of 216921119 is about 600.8516784639.

The spelling of 216921119 in words is "two hundred sixteen million, nine hundred twenty-one thousand, one hundred nineteen".