21223240401 has 24 divisors (see below), whose sum is σ = 31631251680. Its totient is φ = 12644547520.

The previous prime is 21223240399. The next prime is 21223240417. The reversal of 21223240401 is 10404232212.

It is not a de Polignac number, because 21223240401 - 2¹ = 21223240399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21223242401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474060 + ... + 516893.

It is an arithmetic number, because the mean of its divisors is an integer number (1317968820).

Almost surely, 2^21223240401 is an apocalyptic number.

It is an amenable number.

21223240401 is a deficient number, since it is larger than the sum of its proper divisors (10408011279).

21223240401 is a wasteful number, since it uses less digits than its factorization.

21223240401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991037 (or 991026 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21223240401 its reverse (10404232212), we get a palindrome (31627472613).

The spelling of 21223240401 in words is "twenty-one billion, two hundred twenty-three million, two hundred forty thousand, four hundred one".