21798429461 has 2 divisors, whose sum is σ = 21798429462. Its totient is φ = 21798429460.

The previous prime is 21798429379. The next prime is 21798429463. The reversal of 21798429461 is 16492489712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19967103025 + 1831326436 = 141305^2 + 42794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21798429461 is a prime.

Together with 21798429463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21798429463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10899214730 + 10899214731.

It is an arithmetic number, because the mean of its divisors is an integer number (10899214731).

Almost surely, 2^21798429461 is an apocalyptic number.

It is an amenable number.

21798429461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21798429461 is an equidigital number, since it uses as much as digits as its factorization.

21798429461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 21798429461 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred twenty-nine thousand, four hundred sixty-one".