21423204001 has 8 divisors (see below), whose sum is σ = 21539811464. Its totient is φ = 21306654720.

The previous prime is 21423203827. The next prime is 21423204029. The reversal of 21423204001 is 10040232412.

It can be written as a sum of positive squares in 4 ways, for example, as 6033560976 + 15389643025 = 77676^2 + 124055^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21423204001 - 2²⁷ = 21288986273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21423204001.

It is not an unprimeable number, because it can be changed into a prime (21423204701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868105 + ... + 892441.

It is an arithmetic number, because the mean of its divisors is an integer number (2692476433).

Almost surely, 2^21423204001 is an apocalyptic number.

It is an amenable number.

21423204001 is a deficient number, since it is larger than the sum of its proper divisors (116607463).

21423204001 is a wasteful number, since it uses less digits than its factorization.

21423204001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29091.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21423204001 its reverse (10040232412), we get a palindrome (31463436413).

The spelling of 21423204001 in words is "twenty-one billion, four hundred twenty-three million, two hundred four thousand, one".