21440214001 has 4 divisors (see below), whose sum is σ = 21558668404. Its totient is φ = 21321759600.

The previous prime is 21440213989. The next prime is 21440214043. The reversal of 21440214001 is 10041204412.

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 5164578225 + 16275635776 = 71865^2 + 127576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440214001 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 21440214001.

It is not an unprimeable number, because it can be changed into a prime (21440214701) 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, 59226930 + ... + 59227291.

It is an arithmetic number, because the mean of its divisors is an integer number (5389667101).

Almost surely, 2^21440214001 is an apocalyptic number.

It is an amenable number.

21440214001 is a deficient number, since it is larger than the sum of its proper divisors (118454403).

21440214001 is a wasteful number, since it uses less digits than its factorization.

21440214001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118454402.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21440214001 its reverse (10041204412), we get a palindrome (31481418413).

The spelling of 21440214001 in words is "twenty-one billion, four hundred forty million, two hundred fourteen thousand, one".