221532465 has 32 divisors (see below), whose sum is σ = 441916416. Its totient is φ = 92064960.

The previous prime is 221532461. The next prime is 221532497. The reversal of 221532465 is 564235122.

It is not a de Polignac number, because 221532465 - 2² = 221532461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221532461) 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, 94747 + ... + 97056.

It is an arithmetic number, because the mean of its divisors is an integer number (13809888).

Almost surely, 2^221532465 is an apocalyptic number.

It is an amenable number.

221532465 is a deficient number, since it is larger than the sum of its proper divisors (220383951).

221532465 is a wasteful number, since it uses less digits than its factorization.

221532465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191829.

The product of its digits is 14400, while the sum is 30.

The square root of 221532465 is about 14883.9667091807. The cubic root of 221532465 is about 605.0795287389.

Adding to 221532465 its reverse (564235122), we get a palindrome (785767587).

The spelling of 221532465 in words is "two hundred twenty-one million, five hundred thirty-two thousand, four hundred sixty-five".