211465221 has 16 divisors (see below), whose sum is σ = 307845120. Its totient is φ = 128052720.

The previous prime is 211465213. The next prime is 211465273. The reversal of 211465221 is 122564112.

It is not a de Polignac number, because 211465221 - 2³ = 211465213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211465191 and 211465200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211465201) 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, 56226 + ... + 59868.

It is an arithmetic number, because the mean of its divisors is an integer number (19240320).

Almost surely, 2^211465221 is an apocalyptic number.

It is an amenable number.

211465221 is a deficient number, since it is larger than the sum of its proper divisors (96379899).

211465221 is a wasteful number, since it uses less digits than its factorization.

211465221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416.

The product of its digits is 960, while the sum is 24.

The square root of 211465221 is about 14541.8437964379. The cubic root of 211465221 is about 595.7713987862.

The spelling of 211465221 in words is "two hundred eleven million, four hundred sixty-five thousand, two hundred twenty-one".