21033115361 has 2 divisors, whose sum is σ = 21033115362. Its totient is φ = 21033115360.

The previous prime is 21033115357. The next prime is 21033115373. The reversal of 21033115361 is 16351133012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14696955361 + 6336160000 = 121231^2 + 79600^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033115361 - 2² = 21033115357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033115361.

It is not a weakly prime, because it can be changed into another prime (21033145361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516557680 + 10516557681.

It is an arithmetic number, because the mean of its divisors is an integer number (10516557681).

Almost surely, 2^21033115361 is an apocalyptic number.

It is an amenable number.

21033115361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033115361 is an equidigital number, since it uses as much as digits as its factorization.

21033115361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

Adding to 21033115361 its reverse (16351133012), we get a palindrome (37384248373).

The spelling of 21033115361 in words is "twenty-one billion, thirty-three million, one hundred fifteen thousand, three hundred sixty-one".