221152505 has 16 divisors (see below), whose sum is σ = 305337600. Its totient is φ = 150626112.

The previous prime is 221152493. The next prime is 221152513. The reversal of 221152505 is 505251122.

It is not a de Polignac number, because 221152505 - 2¹⁴ = 221136121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15989 + ... + 26418.

It is an arithmetic number, because the mean of its divisors is an integer number (19083600).

Almost surely, 2^221152505 is an apocalyptic number.

It is an amenable number.

221152505 is a deficient number, since it is larger than the sum of its proper divisors (84185095).

221152505 is a wasteful number, since it uses less digits than its factorization.

221152505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42568.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 221152505 is about 14871.1971609551. The cubic root of 221152505 is about 604.7333980055.

The spelling of 221152505 in words is "two hundred twenty-one million, one hundred fifty-two thousand, five hundred five".