4322121021 has 24 divisors (see below), whose sum is σ = 6620458104. Its totient is φ = 2707752960.

The previous prime is 4322121019. The next prime is 4322121031. The reversal of 4322121021 is 1201212234.

It is a happy number.

4322121021 is a `hidden beast` number, since 432 + 2 + 1 + 210 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2293068996 + 2029052025 = 47886^2 + 45045^2 .

It is not a de Polignac number, because 4322121021 - 2¹ = 4322121019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4322120985 and 4322121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4322121031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79765 + ... + 122501.

It is an arithmetic number, because the mean of its divisors is an integer number (275852421).

Almost surely, 2^4322121021 is an apocalyptic number.

It is an amenable number.

4322121021 is a deficient number, since it is larger than the sum of its proper divisors (2298337083).

4322121021 is a wasteful number, since it uses less digits than its factorization.

4322121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43421 (or 43418 counting only the distinct ones).

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

The square root of 4322121021 is about 65742.8400740339. The cubic root of 4322121021 is about 1628.9170697155.

Adding to 4322121021 its reverse (1201212234), we get a palindrome (5523333255).

The spelling of 4322121021 in words is "four billion, three hundred twenty-two million, one hundred twenty-one thousand, twenty-one".