221042465 has 16 divisors (see below), whose sum is σ = 303414528. Its totient is φ = 151436736.

The previous prime is 221042461. The next prime is 221042491. The reversal of 221042465 is 564240122.

221042465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221042465 - 2² = 221042461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221042461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51959 + ... + 56051.

It is an arithmetic number, because the mean of its divisors is an integer number (18963408).

Almost surely, 2^221042465 is an apocalyptic number.

It is an amenable number.

221042465 is a deficient number, since it is larger than the sum of its proper divisors (82372063).

221042465 is a wasteful number, since it uses less digits than its factorization.

221042465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 221042465 is about 14867.4969312255. The cubic root of 221042465 is about 604.6330812532.

Adding to 221042465 its reverse (564240122), we get a palindrome (785282587).

The spelling of 221042465 in words is "two hundred twenty-one million, forty-two thousand, four hundred sixty-five".