221402522 has 16 divisors (see below), whose sum is σ = 362748672. Its totient is φ = 100511520.

The previous prime is 221402513. The next prime is 221402539. The reversal of 221402522 is 225204122.

221402522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221402494 and 221402503.

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, 12983 + ... + 24725.

It is an arithmetic number, because the mean of its divisors is an integer number (22671792).

Almost surely, 2^221402522 is an apocalyptic number.

221402522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221402522 is a deficient number, since it is larger than the sum of its proper divisors (141346150).

221402522 is a wasteful number, since it uses less digits than its factorization.

221402522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12613.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221402522 is about 14879.6008683029. The cubic root of 221402522 is about 604.9611996154.

Adding to 221402522 its reverse (225204122), we get a palindrome (446606644).

The spelling of 221402522 in words is "two hundred twenty-one million, four hundred two thousand, five hundred twenty-two".