21435043001 has 8 divisors (see below), whose sum is σ = 21595734600. Its totient is φ = 21274576128.

The previous prime is 21435042991. The next prime is 21435043013. The reversal of 21435043001 is 10034053412.

It can be written as a sum of positive squares in 4 ways, for example, as 6684697600 + 14750345401 = 81760^2 + 121451^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435043001 is a prime.

It is a super-2 number, since 2×21435043001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435043051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137795 + ... + 248711.

It is an arithmetic number, because the mean of its divisors is an integer number (2699466825).

Almost surely, 2^21435043001 is an apocalyptic number.

It is an amenable number.

21435043001 is a deficient number, since it is larger than the sum of its proper divisors (160691599).

21435043001 is a wasteful number, since it uses less digits than its factorization.

21435043001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112363.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21435043001 its reverse (10034053412), we get a palindrome (31469096413).

The spelling of 21435043001 in words is "twenty-one billion, four hundred thirty-five million, forty-three thousand, one".