21433240061 has 2 divisors, whose sum is σ = 21433240062. Its totient is φ = 21433240060.

The previous prime is 21433240057. The next prime is 21433240109. The reversal of 21433240061 is 16004233412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18422632900 + 3010607161 = 135730^2 + 54869^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433240061 - 2² = 21433240057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21433240061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433240861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716620030 + 10716620031.

It is an arithmetic number, because the mean of its divisors is an integer number (10716620031).

Almost surely, 2^21433240061 is an apocalyptic number.

It is an amenable number.

21433240061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433240061 is an equidigital number, since it uses as much as digits as its factorization.

21433240061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21433240061 its reverse (16004233412), we get a palindrome (37437473473).

The spelling of 21433240061 in words is "twenty-one billion, four hundred thirty-three million, two hundred forty thousand, sixty-one".