214445021 has 12 divisors (see below), whose sum is σ = 264131388. Its totient is φ = 172996992.

The previous prime is 214445017. The next prime is 214445027. The reversal of 214445021 is 120544412.

It can be written as a sum of positive squares in 2 ways, for example, as 144120025 + 70324996 = 12005^2 + 8386^2 .

It is not a de Polignac number, because 214445021 - 2² = 214445017 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 (214445027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127886 + ... + 129551.

It is an arithmetic number, because the mean of its divisors is an integer number (22010949).

Almost surely, 2^214445021 is an apocalyptic number.

It is an amenable number.

214445021 is a deficient number, since it is larger than the sum of its proper divisors (49686367).

214445021 is a wasteful number, since it uses less digits than its factorization.

214445021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257468 (or 257461 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 214445021 is about 14643.9414434776. The cubic root of 214445021 is about 598.5567357270.

Adding to 214445021 its reverse (120544412), we get a palindrome (334989433).

The spelling of 214445021 in words is "two hundred fourteen million, four hundred forty-five thousand, twenty-one".