21122320001 has 8 divisors (see below), whose sum is σ = 21509826408. Its totient is φ = 20736144000.

The previous prime is 21122319983. The next prime is 21122320039. The reversal of 21122320001 is 10002322112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2064793600 + 19057526401 = 45440^2 + 138049^2 .

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 21122320001 - 2¹⁸ = 21122057857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122320601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300530 + ... + 364091.

It is an arithmetic number, because the mean of its divisors is an integer number (2688728301).

Almost surely, 2^21122320001 is an apocalyptic number.

It is an amenable number.

21122320001 is a deficient number, since it is larger than the sum of its proper divisors (387506407).

21122320001 is an equidigital number, since it uses as much as digits as its factorization.

21122320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665203.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21122320001 its reverse (10002322112), we get a palindrome (31124642113).

The spelling of 21122320001 in words is "twenty-one billion, one hundred twenty-two million, three hundred twenty thousand, one".