221240402 has 16 divisors (see below), whose sum is σ = 337390272. Its totient is φ = 108785040.

The previous prime is 221240377. The next prime is 221240417. The reversal of 221240402 is 204042122.

It is a happy number.

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, 61148 + ... + 64664.

It is an arithmetic number, because the mean of its divisors is an integer number (21086892).

Almost surely, 2^221240402 is an apocalyptic number.

221240402 is a deficient number, since it is larger than the sum of its proper divisors (116149870).

221240402 is a wasteful number, since it uses less digits than its factorization.

221240402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221240402 is about 14874.1521439039. The cubic root of 221240402 is about 604.8135044325.

Adding to 221240402 its reverse (204042122), we get a palindrome (425282524).

The spelling of 221240402 in words is "two hundred twenty-one million, two hundred forty thousand, four hundred two".