21433714637 has 2 divisors, whose sum is σ = 21433714638. Its totient is φ = 21433714636.

The previous prime is 21433714633. The next prime is 21433714639. The reversal of 21433714637 is 73641733412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15848543881 + 5585170756 = 125891^2 + 74734^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433714637 - 2² = 21433714633 is a prime.

Together with 21433714639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21433714594 and 21433714603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433714633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716857318 + 10716857319.

It is an arithmetic number, because the mean of its divisors is an integer number (10716857319).

Almost surely, 2^21433714637 is an apocalyptic number.

It is an amenable number.

21433714637 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433714637 is an equidigital number, since it uses as much as digits as its factorization.

21433714637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 41.

The spelling of 21433714637 in words is "twenty-one billion, four hundred thirty-three million, seven hundred fourteen thousand, six hundred thirty-seven".