221402352 has 20 divisors (see below), whose sum is σ = 571956200. Its totient is φ = 73800768.

The previous prime is 221402329. The next prime is 221402381. The reversal of 221402352 is 253204122.

It is a super-2 number, since 2×221402352² = 98038002942263808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2306227 + ... + 2306322.

It is an arithmetic number, because the mean of its divisors is an integer number (28597810).

Almost surely, 2^221402352 is an apocalyptic number.

It is an amenable number.

221402352 is an abundant number, since it is smaller than the sum of its proper divisors (350553848).

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

221402352 is a wasteful number, since it uses less digits than its factorization.

221402352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612560 (or 4612554 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221402352 is about 14879.5951557830. The cubic root of 221402352 is about 604.9610447791.

Adding to 221402352 its reverse (253204122), we get a palindrome (474606474).

The spelling of 221402352 in words is "two hundred twenty-one million, four hundred two thousand, three hundred fifty-two".