221513070 has 32 divisors (see below), whose sum is σ = 536516640. Its totient is φ = 58527360.

The previous prime is 221513063. The next prime is 221513093. The reversal of 221513070 is 70315122.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30601 + ... + 37140.

It is an arithmetic number, because the mean of its divisors is an integer number (16766145).

Almost surely, 2^221513070 is an apocalyptic number.

221513070 is an abundant number, since it is smaller than the sum of its proper divisors (315003570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221513070 is a wasteful number, since it uses less digits than its factorization.

221513070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67860.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 221513070 is about 14883.3151548974. The cubic root of 221513070 is about 605.0618701383.

Adding to 221513070 its reverse (70315122), we get a palindrome (291828192).

The spelling of 221513070 in words is "two hundred twenty-one million, five hundred thirteen thousand, seventy".