221420234 has 16 divisors (see below), whose sum is σ = 379857408. Its totient is φ = 94824432.

The previous prime is 221420231. The next prime is 221420237. The reversal of 221420234 is 432024122.

221420234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221420231) and next prime (221420237).

It is a super-2 number, since 2×221420234² = 98053840049229512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221420231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16892 + ... + 26984.

It is an arithmetic number, because the mean of its divisors is an integer number (23741088).

Almost surely, 2^221420234 is an apocalyptic number.

221420234 is a deficient number, since it is larger than the sum of its proper divisors (158437174).

221420234 is a wasteful number, since it uses less digits than its factorization.

221420234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11669.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221420234 is about 14880.1960336549. The cubic root of 221420234 is about 604.9773313001.

Adding to 221420234 its reverse (432024122), we get a palindrome (653444356).

The spelling of 221420234 in words is "two hundred twenty-one million, four hundred twenty thousand, two hundred thirty-four".