221034513 has 16 divisors (see below), whose sum is σ = 337084416. Its totient is φ = 126204240.

The previous prime is 221034511. The next prime is 221034523. The reversal of 221034513 is 315430122.

It is not a de Polignac number, because 221034513 - 2¹ = 221034511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221034513.

It is not an unprimeable number, because it can be changed into a prime (221034511) 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, 28528 + ... + 35438.

It is an arithmetic number, because the mean of its divisors is an integer number (21067776).

Almost surely, 2^221034513 is an apocalyptic number.

It is an amenable number.

221034513 is a deficient number, since it is larger than the sum of its proper divisors (116049903).

221034513 is a wasteful number, since it uses less digits than its factorization.

221034513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8444.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221034513 is about 14867.2294998093. The cubic root of 221034513 is about 604.6258306103.

Adding to 221034513 its reverse (315430122), we get a palindrome (536464635).

The spelling of 221034513 in words is "two hundred twenty-one million, thirty-four thousand, five hundred thirteen".