221402024 has 8 divisors (see below), whose sum is σ = 415128810. Its totient is φ = 110701008.

The previous prime is 221402023. The next prime is 221402029. The reversal of 221402024 is 420204122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 119028100 + 102373924 = 10910^2 + 10118^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 221401993 and 221402011.

It is not an unprimeable number, because it can be changed into a prime (221402023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13837619 + ... + 13837634.

Almost surely, 2^221402024 is an apocalyptic number.

It is an amenable number.

221402024 is a deficient number, since it is larger than the sum of its proper divisors (193726786).

221402024 is a wasteful number, since it uses less digits than its factorization.

221402024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27675259 (or 27675255 counting only the distinct ones).

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

The square root of 221402024 is about 14879.5841339736. The cubic root of 221402024 is about 604.9607460359.

Adding to 221402024 its reverse (420204122), we get a palindrome (641606146).

The spelling of 221402024 in words is "two hundred twenty-one million, four hundred two thousand, twenty-four".