21043352001 has 8 divisors (see below), whose sum is σ = 32066060224. Its totient is φ = 12024772560.

The previous prime is 21043351999. The next prime is 21043352003. The reversal of 21043352001 is 10025334012.

It is an interprime number because it is at equal distance from previous prime (21043351999) and next prime (21043352003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21043352001 - 2¹ = 21043351999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1002064381 = 21043352001 / (2 + 1 + 0 + 4 + 3 + 3 + 5 + 2 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043352003) 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 7 ways as a sum of consecutive naturals, for example, 501032170 + ... + 501032211.

It is an arithmetic number, because the mean of its divisors is an integer number (4008257528).

Almost surely, 2^21043352001 is an apocalyptic number.

21043352001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21043352001 is a deficient number, since it is larger than the sum of its proper divisors (11022708223).

21043352001 is a wasteful number, since it uses less digits than its factorization.

21043352001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002064391.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21043352001 its reverse (10025334012), we get a palindrome (31068686013).

The spelling of 21043352001 in words is "twenty-one billion, forty-three million, three hundred fifty-two thousand, one".