221521034 has 32 divisors (see below), whose sum is σ = 386480640. Its totient is φ = 93270528.

The previous prime is 221521031. The next prime is 221521037. The reversal of 221521034 is 430125122.

It is an interprime number because it is at equal distance from previous prime (221521031) and next prime (221521037).

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 221520997 and 221521015.

It is not an unprimeable number, because it can be changed into a prime (221521031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212687 + ... + 213725.

It is an arithmetic number, because the mean of its divisors is an integer number (12077520).

Almost surely, 2^221521034 is an apocalyptic number.

221521034 is a deficient number, since it is larger than the sum of its proper divisors (164959606).

221521034 is a wasteful number, since it uses less digits than its factorization.

221521034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221521034 is about 14883.5827004119. The cubic root of 221521034 is about 605.0691212604.

Adding to 221521034 its reverse (430125122), we get a palindrome (651646156).

The spelling of 221521034 in words is "two hundred twenty-one million, five hundred twenty-one thousand, thirty-four".