221405422 has 12 divisors (see below), whose sum is σ = 386330040. Its totient is φ = 94887996.

The previous prime is 221405413. The next prime is 221405473. The reversal of 221405422 is 224504122.

221405422 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 = 221405393 and 221405402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129522 + ... + 1129717.

It is an arithmetic number, because the mean of its divisors is an integer number (32194170).

Almost surely, 2^221405422 is an apocalyptic number.

221405422 is a deficient number, since it is larger than the sum of its proper divisors (164924618).

221405422 is a wasteful number, since it uses less digits than its factorization.

221405422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259255 (or 2259248 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 221405422 is about 14879.6983168342. The cubic root of 221405422 is about 604.9638409280.

Adding to 221405422 its reverse (224504122), we get a palindrome (445909544).

The spelling of 221405422 in words is "two hundred twenty-one million, four hundred five thousand, four hundred twenty-two".