4000421321 has 4 divisors (see below), whose sum is σ = 4308146052. Its totient is φ = 3692696592.

The previous prime is 4000421311. The next prime is 4000421339. The reversal of 4000421321 is 1231240004.

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 1286011321 + 2714410000 = 35861^2 + 52100^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4000421321 is a prime.

It is a super-2 number, since 2×4000421321² = 32006741491022770082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4000421321.

It is not an unprimeable number, because it can be changed into a prime (4000421311) 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, 153862346 + ... + 153862371.

It is an arithmetic number, because the mean of its divisors is an integer number (1077036513).

Almost surely, 2^4000421321 is an apocalyptic number.

It is an amenable number.

4000421321 is a deficient number, since it is larger than the sum of its proper divisors (307724731).

4000421321 is a wasteful number, since it uses less digits than its factorization.

4000421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307724730.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4000421321 is about 63248.8839506279. The cubic root of 4000421321 is about 1587.4567837947.

Adding to 4000421321 its reverse (1231240004), we get a palindrome (5231661325).

The spelling of 4000421321 in words is "four billion, four hundred twenty-one thousand, three hundred twenty-one".