221420043 has 24 divisors (see below), whose sum is σ = 344962800. Its totient is φ = 136048320.

The previous prime is 221420041. The next prime is 221420051. The reversal of 221420043 is 340024122.

It is not a de Polignac number, because 221420043 - 2¹ = 221420041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221419998 and 221420025.

It is not an unprimeable number, because it can be changed into a prime (221420041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112633 + ... + 114581.

It is an arithmetic number, because the mean of its divisors is an integer number (14373450).

Almost surely, 2^221420043 is an apocalyptic number.

221420043 is a deficient number, since it is larger than the sum of its proper divisors (123542757).

221420043 is a wasteful number, since it uses less digits than its factorization.

221420043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939 (or 2936 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 221420043 is about 14880.1896157273. The cubic root of 221420043 is about 604.9771573462.

Adding to 221420043 its reverse (340024122), we get a palindrome (561444165).

The spelling of 221420043 in words is "two hundred twenty-one million, four hundred twenty thousand, forty-three".