4001632421 has 4 divisors (see below), whose sum is σ = 4001760000. Its totient is φ = 4001504844.

The previous prime is 4001632409. The next prime is 4001632429. The reversal of 4001632421 is 1242361004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4001632421 - 2¹⁰ = 4001631397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001632429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19580 + ... + 91578.

It is an arithmetic number, because the mean of its divisors is an integer number (1000440000).

Almost surely, 2^4001632421 is an apocalyptic number.

It is an amenable number.

4001632421 is a deficient number, since it is larger than the sum of its proper divisors (127579).

4001632421 is an equidigital number, since it uses as much as digits as its factorization.

4001632421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127578.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 4001632421 is about 63258.4573080944. The cubic root of 4001632421 is about 1587.6169648335.

Adding to 4001632421 its reverse (1242361004), we get a palindrome (5243993425).

The spelling of 4001632421 in words is "four billion, one million, six hundred thirty-two thousand, four hundred twenty-one".