21423013001 has 4 divisors (see below), whose sum is σ = 23070937092. Its totient is φ = 19775088912.

The previous prime is 21423012997. The next prime is 21423013009. The reversal of 21423013001 is 10031032412.

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 13794737401 + 7628275600 = 117451^2 + 87340^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423013001 - 2² = 21423012997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423013009) 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 3 ways as a sum of consecutive naturals, for example, 823962026 + ... + 823962051.

It is an arithmetic number, because the mean of its divisors is an integer number (5767734273).

Almost surely, 2^21423013001 is an apocalyptic number.

It is an amenable number.

21423013001 is a deficient number, since it is larger than the sum of its proper divisors (1647924091).

21423013001 is a wasteful number, since it uses less digits than its factorization.

21423013001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647924090.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21423013001 its reverse (10031032412), we get a palindrome (31454045413).

The spelling of 21423013001 in words is "twenty-one billion, four hundred twenty-three million, thirteen thousand, one".