221311402 has 32 divisors (see below), whose sum is σ = 366436224. Its totient is φ = 99624000.

The previous prime is 221311381. The next prime is 221311403. The reversal of 221311402 is 204113122.

221311402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221311403) 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, 185853 + ... + 187039.

It is an arithmetic number, because the mean of its divisors is an integer number (11451132).

Almost surely, 2^221311402 is an apocalyptic number.

221311402 is a deficient number, since it is larger than the sum of its proper divisors (145124822).

221311402 is a wasteful number, since it uses less digits than its factorization.

221311402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221311402 is about 14876.5386431118. The cubic root of 221311402 is about 604.8781960013.

Adding to 221311402 its reverse (204113122), we get a palindrome (425424524).

The spelling of 221311402 in words is "two hundred twenty-one million, three hundred eleven thousand, four hundred two".