4640202421 has 4 divisors (see below), whose sum is σ = 4640441452. Its totient is φ = 4639963392.

The previous prime is 4640202409. The next prime is 4640202487. The reversal of 4640202421 is 1242020464.

It is a happy number.

4640202421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 751308100 + 3888894321 = 27410^2 + 62361^2 .

It is a cyclic number.

It is not a de Polignac number, because 4640202421 - 2¹⁹ = 4639678133 is a prime.

It is a super-2 number, since 2×4640202421² = 43062957015708522482, 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 (4640202121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87546 + ... + 130171.

It is an arithmetic number, because the mean of its divisors is an integer number (1160110363).

Almost surely, 2^4640202421 is an apocalyptic number.

It is an amenable number.

4640202421 is a deficient number, since it is larger than the sum of its proper divisors (239031).

4640202421 is a wasteful number, since it uses less digits than its factorization.

4640202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239030.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 4640202421 is about 68119.0312688018. The cubic root of 4640202421 is about 1667.9344370416.

Adding to 4640202421 its reverse (1242020464), we get a palindrome (5882222885).

The spelling of 4640202421 in words is "four billion, six hundred forty million, two hundred two thousand, four hundred twenty-one".