21124321301 has 2 divisors, whose sum is σ = 21124321302. Its totient is φ = 21124321300.

The previous prime is 21124321297. The next prime is 21124321313. The reversal of 21124321301 is 10312342112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18564062500 + 2560258801 = 136250^2 + 50599^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124321301 - 2² = 21124321297 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124321321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562160650 + 10562160651.

It is an arithmetic number, because the mean of its divisors is an integer number (10562160651).

Almost surely, 2^21124321301 is an apocalyptic number.

It is an amenable number.

21124321301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124321301 is an equidigital number, since it uses as much as digits as its factorization.

21124321301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21124321301 its reverse (10312342112), we get a palindrome (31436663413).

The spelling of 21124321301 in words is "twenty-one billion, one hundred twenty-four million, three hundred twenty-one thousand, three hundred one".