21435132013 has 2 divisors, whose sum is σ = 21435132014. Its totient is φ = 21435132012.

The previous prime is 21435131999. The next prime is 21435132029. The reversal of 21435132013 is 31023153412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21385260169 + 49871844 = 146237^2 + 7062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435132013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21435132053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717566006 + 10717566007.

It is an arithmetic number, because the mean of its divisors is an integer number (10717566007).

Almost surely, 2^21435132013 is an apocalyptic number.

It is an amenable number.

21435132013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435132013 is an equidigital number, since it uses as much as digits as its factorization.

21435132013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21435132013 its reverse (31023153412), we get a palindrome (52458285425).

The spelling of 21435132013 in words is "twenty-one billion, four hundred thirty-five million, one hundred thirty-two thousand, thirteen".