4221212231 has 4 divisors (see below), whose sum is σ = 4222327752. Its totient is φ = 4220096712.

The previous prime is 4221212209. The next prime is 4221212267. The reversal of 4221212231 is 1322121224.

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

It is a cyclic number.

It is not a de Polignac number, because 4221212231 - 2¹⁰ = 4221211207 is a prime.

It is a super-2 number, since 2×4221212231² = 35637265398287994722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221212531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552065 + ... + 559658.

It is an arithmetic number, because the mean of its divisors is an integer number (1055581938).

Almost surely, 2^4221212231 is an apocalyptic number.

4221212231 is a deficient number, since it is larger than the sum of its proper divisors (1115521).

4221212231 is a wasteful number, since it uses less digits than its factorization.

4221212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115520.

The product of its digits is 384, while the sum is 20.

The square root of 4221212231 is about 64970.8567820988. The cubic root of 4221212231 is about 1616.1403099210.

Adding to 4221212231 its reverse (1322121224), we get a palindrome (5543333455).

It can be divided in two parts, 422121223 and 1, that added together give a palindrome (422121224).

The spelling of 4221212231 in words is "four billion, two hundred twenty-one million, two hundred twelve thousand, two hundred thirty-one".