4521111221 has 8 divisors (see below), whose sum is σ = 4935324000. Its totient is φ = 4107432240.

The previous prime is 4521111209. The next prime is 4521111229. The reversal of 4521111221 is 1221111254.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4521111221 is a prime.

It is a super-2 number, since 2×4521111221² = 40880893345304221682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4521111193 and 4521111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521111229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115631 + ... + 149708.

It is an arithmetic number, because the mean of its divisors is an integer number (616915500).

Almost surely, 2^4521111221 is an apocalyptic number.

It is an amenable number.

4521111221 is a deficient number, since it is larger than the sum of its proper divisors (414212779).

4521111221 is a wasteful number, since it uses less digits than its factorization.

4521111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266899.

The product of its digits is 160, while the sum is 20.

The square root of 4521111221 is about 67239.2089557871. The cubic root of 4521111221 is about 1653.5413648394.

Adding to 4521111221 its reverse (1221111254), we get a palindrome (5742222475).

The spelling of 4521111221 in words is "four billion, five hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".