21240033301 has 2 divisors, whose sum is σ = 21240033302. Its totient is φ = 21240033300.

The previous prime is 21240033293. The next prime is 21240033323. The reversal of 21240033301 is 10333004212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15073700625 + 6166332676 = 122775^2 + 78526^2 .

It is a cyclic number.

It is not a de Polignac number, because 21240033301 - 2³ = 21240033293 is a prime.

It is a super-2 number, since 2×21240033301² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21240033901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620016650 + 10620016651.

It is an arithmetic number, because the mean of its divisors is an integer number (10620016651).

Almost surely, 2^21240033301 is an apocalyptic number.

It is an amenable number.

21240033301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240033301 is an equidigital number, since it uses as much as digits as its factorization.

21240033301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21240033301 its reverse (10333004212), we get a palindrome (31573037513).

The spelling of 21240033301 in words is "twenty-one billion, two hundred forty million, thirty-three thousand, three hundred one".