221506704 has 40 divisors (see below), whose sum is σ = 635807520. Its totient is φ = 73835424.

The previous prime is 221506697. The next prime is 221506729. The reversal of 221506704 is 407605122.

221506704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255942 + ... + 256805.

It is an arithmetic number, because the mean of its divisors is an integer number (15895188).

Almost surely, 2^221506704 is an apocalyptic number.

221506704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221506704 is an abundant number, since it is smaller than the sum of its proper divisors (414300816).

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

221506704 is a wasteful number, since it uses less digits than its factorization.

221506704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512764 (or 512752 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 221506704 is about 14883.1012897178. The cubic root of 221506704 is about 605.0560738501.

The spelling of 221506704 in words is "two hundred twenty-one million, five hundred six thousand, seven hundred four".