21310321801 has 2 divisors, whose sum is σ = 21310321802. Its totient is φ = 21310321800.

The previous prime is 21310321793. The next prime is 21310321829. The reversal of 21310321801 is 10812301312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21105116176 + 205205625 = 145276^2 + 14325^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310321801 - 2³ = 21310321793 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310321871) 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 as a sum of consecutive naturals, namely, 10655160900 + 10655160901.

It is an arithmetic number, because the mean of its divisors is an integer number (10655160901).

Almost surely, 2^21310321801 is an apocalyptic number.

It is an amenable number.

21310321801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310321801 is an equidigital number, since it uses as much as digits as its factorization.

21310321801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21310321801 in words is "twenty-one billion, three hundred ten million, three hundred twenty-one thousand, eight hundred one".