221370434 has 4 divisors (see below), whose sum is σ = 332055654. Its totient is φ = 110685216.

The previous prime is 221370433. The next prime is 221370449. The reversal of 221370434 is 434073122.

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

It can be written as a sum of positive squares in only one way, i.e., 165045409 + 56325025 = 12847^2 + 7505^2 .

It is not an unprimeable number, because it can be changed into a prime (221370431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55342607 + ... + 55342610.

Almost surely, 2^221370434 is an apocalyptic number.

221370434 is a deficient number, since it is larger than the sum of its proper divisors (110685220).

221370434 is a wasteful number, since it uses less digits than its factorization.

221370434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110685219.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 221370434 is about 14878.5225745032. The cubic root of 221370434 is about 604.9319724071.

The spelling of 221370434 in words is "two hundred twenty-one million, three hundred seventy thousand, four hundred thirty-four".