21033243001 has 2 divisors, whose sum is σ = 21033243002. Its totient is φ = 21033243000.

The previous prime is 21033242983. The next prime is 21033243037. The reversal of 21033243001 is 10034233012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15490291600 + 5542951401 = 124460^2 + 74451^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033243001 - 2²³ = 21024854393 is a prime.

It is a super-2 number, since 2×21033243001² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21033243001.

It is not a weakly prime, because it can be changed into another prime (21033246001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516621500 + 10516621501.

It is an arithmetic number, because the mean of its divisors is an integer number (10516621501).

Almost surely, 2^21033243001 is an apocalyptic number.

It is an amenable number.

21033243001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033243001 is an equidigital number, since it uses as much as digits as its factorization.

21033243001 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 21033243001 its reverse (10034233012), we get a palindrome (31067476013).

The spelling of 21033243001 in words is "twenty-one billion, thirty-three million, two hundred forty-three thousand, one".