4213021221 has 16 divisors (see below), whose sum is σ = 6570014400. Its totient is φ = 2660855184.

The previous prime is 4213021207. The next prime is 4213021237. The reversal of 4213021221 is 1221203124.

It is a happy number.

4213021221 is a `hidden beast` number, since 421 + 3 + 0 + 21 + 221 = 666.

It is not a de Polignac number, because 4213021221 - 2¹⁰ = 4213020197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4213021194 and 4213021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4213021261) 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, 4105746 + ... + 4106771.

It is an arithmetic number, because the mean of its divisors is an integer number (410625900).

Almost surely, 2^4213021221 is an apocalyptic number.

It is an amenable number.

4213021221 is a deficient number, since it is larger than the sum of its proper divisors (2356993179).

4213021221 is a wasteful number, since it uses less digits than its factorization.

4213021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8212545 (or 8212539 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4213021221 is about 64907.7901410917. The cubic root of 4213021221 is about 1615.0942918297.

Adding to 4213021221 its reverse (1221203124), we get a palindrome (5434224345).

The spelling of 4213021221 in words is "four billion, two hundred thirteen million, twenty-one thousand, two hundred twenty-one".