4001132421 has 48 divisors (see below), whose sum is σ = 6797831040. Its totient is φ = 2235749760.

The previous prime is 4001132383. The next prime is 4001132431. The reversal of 4001132421 is 1242311004.

It is not a de Polignac number, because 4001132421 - 2⁹ = 4001131909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4001132394 and 4001132403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001132431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1696375 + ... + 1698731.

It is an arithmetic number, because the mean of its divisors is an integer number (141621480).

Almost surely, 2^4001132421 is an apocalyptic number.

It is an amenable number.

4001132421 is a deficient number, since it is larger than the sum of its proper divisors (2796698619).

4001132421 is a wasteful number, since it uses less digits than its factorization.

4001132421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706 (or 3703 counting only the distinct ones).

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

The square root of 4001132421 is about 63254.5051439026. The cubic root of 4001132421 is about 1587.5508383579.

Adding to 4001132421 its reverse (1242311004), we get a palindrome (5243443425).

The spelling of 4001132421 in words is "four billion, one million, one hundred thirty-two thousand, four hundred twenty-one".