221330487 has 32 divisors (see below), whose sum is σ = 357696000. Its totient is φ = 118914048.

The previous prime is 221330477. The next prime is 221330507. The reversal of 221330487 is 784033122.

It is not a de Polignac number, because 221330487 - 2⁴ = 221330471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52639 + ... + 56687.

It is an arithmetic number, because the mean of its divisors is an integer number (11178000).

Almost surely, 2^221330487 is an apocalyptic number.

221330487 is a deficient number, since it is larger than the sum of its proper divisors (136365513).

221330487 is a wasteful number, since it uses less digits than its factorization.

221330487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 221330487 is about 14877.1800755385. The cubic root of 221330487 is about 604.8955829177.

The spelling of 221330487 in words is "two hundred twenty-one million, three hundred thirty thousand, four hundred eighty-seven".