221512010 has 8 divisors (see below), whose sum is σ = 398721636. Its totient is φ = 88604800.

The previous prime is 221512001. The next prime is 221512021. The reversal of 221512010 is 10215122.

It can be written as a sum of positive squares in 2 ways, for example, as 212080969 + 9431041 = 14563^2 + 3071^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11075591 + ... + 11075610.

Almost surely, 2^221512010 is an apocalyptic number.

221512010 is a deficient number, since it is larger than the sum of its proper divisors (177209626).

221512010 is a wasteful number, since it uses less digits than its factorization.

221512010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22151208.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 221512010 is about 14883.2795445090. The cubic root of 221512010 is about 605.0609050085.

Adding to 221512010 its reverse (10215122), we get a palindrome (231727132).

The spelling of 221512010 in words is "two hundred twenty-one million, five hundred twelve thousand, ten".