214428921 has 8 divisors (see below), whose sum is σ = 326748864. Its totient is φ = 122530800.

The previous prime is 214428919. The next prime is 214428943. The reversal of 214428921 is 129824412.

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

It is not a de Polignac number, because 214428921 - 2¹ = 214428919 is a prime.

It is a super-2 number, since 2×214428921² = 91959524322448482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (214428901) 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, 5105430 + ... + 5105471.

It is an arithmetic number, because the mean of its divisors is an integer number (40843608).

Almost surely, 2^214428921 is an apocalyptic number.

214428921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

214428921 is a deficient number, since it is larger than the sum of its proper divisors (112319943).

214428921 is a wasteful number, since it uses less digits than its factorization.

214428921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210911.

The product of its digits is 9216, while the sum is 33.

The square root of 214428921 is about 14643.3917177681. The cubic root of 214428921 is about 598.5417559673.

The spelling of 214428921 in words is "two hundred fourteen million, four hundred twenty-eight thousand, nine hundred twenty-one".