221460863 has 4 divisors (see below), whose sum is σ = 238496328. Its totient is φ = 204425400.

The previous prime is 221460847. The next prime is 221460961. The reversal of 221460863 is 368064122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368064122 = 2 ⋅184032061.

It is a cyclic number.

It is not a de Polignac number, because 221460863 - 2⁴ = 221460847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221460823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8517713 + ... + 8517738.

It is an arithmetic number, because the mean of its divisors is an integer number (59624082).

Almost surely, 2^221460863 is an apocalyptic number.

221460863 is a deficient number, since it is larger than the sum of its proper divisors (17035465).

221460863 is a wasteful number, since it uses less digits than its factorization.

221460863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17035464.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 221460863 is about 14881.5611748230. The cubic root of 221460863 is about 605.0143320148.

The spelling of 221460863 in words is "two hundred twenty-one million, four hundred sixty thousand, eight hundred sixty-three".