221420734 has 4 divisors (see below), whose sum is σ = 332131104. Its totient is φ = 110710366.

The previous prime is 221420681. The next prime is 221420741. The reversal of 221420734 is 437024122.

It is a happy number.

221420734 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 221420699 and 221420708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55355182 + ... + 55355185.

It is an arithmetic number, because the mean of its divisors is an integer number (83032776).

Almost surely, 2^221420734 is an apocalyptic number.

221420734 is a deficient number, since it is larger than the sum of its proper divisors (110710370).

221420734 is a wasteful number, since it uses less digits than its factorization.

221420734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110710369.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 221420734 is about 14880.2128344994. The cubic root of 221420734 is about 604.9777866762.

Adding to 221420734 its reverse (437024122), we get a palindrome (658444856).

The spelling of 221420734 in words is "two hundred twenty-one million, four hundred twenty thousand, seven hundred thirty-four".