221863664 has 30 divisors (see below), whose sum is σ = 472495800. Its totient is φ = 100846240.

The previous prime is 221863661. The next prime is 221863667. The reversal of 221863664 is 466368122.

It is an interprime number because it is at equal distance from previous prime (221863661) and next prime (221863667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221863661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55364 + ... + 59235.

It is an arithmetic number, because the mean of its divisors is an integer number (15749860).

Almost surely, 2^221863664 is an apocalyptic number.

It is an amenable number.

221863664 is an abundant number, since it is smaller than the sum of its proper divisors (250632136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221863664 is a wasteful number, since it uses less digits than its factorization.

221863664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114629 (or 114612 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 221863664 is about 14895.0885865107. The cubic root of 221863664 is about 605.3809171433.

The spelling of 221863664 in words is "two hundred twenty-one million, eight hundred sixty-three thousand, six hundred sixty-four".