221342634 has 24 divisors (see below), whose sum is σ = 479852100. Its totient is φ = 73738368.

The previous prime is 221342591. The next prime is 221342659. The reversal of 221342634 is 436243122.

221342634 is a `hidden beast` number, since 2 + 21 + 3 + 4 + 2 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 220611609 + 731025 = 14853^2 + 855^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221342598 and 221342607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52642 + ... + 56690.

Almost surely, 2^221342634 is an apocalyptic number.

221342634 is an abundant number, since it is smaller than the sum of its proper divisors (258509466).

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

221342634 is a wasteful number, since it uses less digits than its factorization.

221342634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094 (or 7091 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 221342634 is about 14877.5883126265. The cubic root of 221342634 is about 604.9066486206.

Adding to 221342634 its reverse (436243122), we get a palindrome (657585756).

The spelling of 221342634 in words is "two hundred twenty-one million, three hundred forty-two thousand, six hundred thirty-four".