221420235 has 16 divisors (see below), whose sum is σ = 355956480. Its totient is φ = 117529440.

The previous prime is 221420231. The next prime is 221420237. The reversal of 221420235 is 532024122.

It is not a de Polignac number, because 221420235 - 2² = 221420231 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 31815 + ... + 38144.

It is an arithmetic number, because the mean of its divisors is an integer number (22247280).

Almost surely, 2^221420235 is an apocalyptic number.

221420235 is a deficient number, since it is larger than the sum of its proper divisors (134536245).

221420235 is a wasteful number, since it uses less digits than its factorization.

221420235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70178.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221420235 is about 14880.1960672566. The cubic root of 221420235 is about 604.9773322108.

Adding to 221420235 its reverse (532024122), we get a palindrome (753444357).

The spelling of 221420235 in words is "two hundred twenty-one million, four hundred twenty thousand, two hundred thirty-five".