21334431001 has 4 divisors (see below), whose sum is σ = 22975541092. Its totient is φ = 19693320912.

The previous prime is 21334430989. The next prime is 21334431017. The reversal of 21334431001 is 10013443312.

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 2505102601 + 18829328400 = 50051^2 + 137220^2 .

It is a cyclic number.

It is not a de Polignac number, because 21334431001 - 2⁹ = 21334430489 is a prime.

It is a super-2 number, since 2×21334431001² (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 (21338431001) 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, 820555026 + ... + 820555051.

It is an arithmetic number, because the mean of its divisors is an integer number (5743885273).

Almost surely, 2^21334431001 is an apocalyptic number.

It is an amenable number.

21334431001 is a deficient number, since it is larger than the sum of its proper divisors (1641110091).

21334431001 is a wasteful number, since it uses less digits than its factorization.

21334431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641110090.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21334431001 its reverse (10013443312), we get a palindrome (31347874313).

The spelling of 21334431001 in words is "twenty-one billion, three hundred thirty-four million, four hundred thirty-one thousand, one".