21310222001 has 4 divisors (see below), whose sum is σ = 21316924404. Its totient is φ = 21303519600.

The previous prime is 21310221979. The next prime is 21310222019. The reversal of 21310222001 is 10022201312.

It is a happy number.

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 7720258225 + 13589963776 = 87865^2 + 116576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310222001 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 (21310222091) 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 3 ways as a sum of consecutive naturals, for example, 3346430 + ... + 3352791.

It is an arithmetic number, because the mean of its divisors is an integer number (5329231101).

Almost surely, 2^21310222001 is an apocalyptic number.

It is an amenable number.

21310222001 is a deficient number, since it is larger than the sum of its proper divisors (6702403).

21310222001 is an equidigital number, since it uses as much as digits as its factorization.

21310222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6702402.

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

Adding to 21310222001 its reverse (10022201312), we get a palindrome (31332423313).

The spelling of 21310222001 in words is "twenty-one billion, three hundred ten million, two hundred twenty-two thousand, one".