21342044461 has 2 divisors, whose sum is σ = 21342044462. Its totient is φ = 21342044460.

The previous prime is 21342044401. The next prime is 21342044467. The reversal of 21342044461 is 16444024312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20240468361 + 1101576100 = 142269^2 + 33190^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342044461 - 2³¹ = 19194560813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342044467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671022230 + 10671022231.

It is an arithmetic number, because the mean of its divisors is an integer number (10671022231).

Almost surely, 2^21342044461 is an apocalyptic number.

It is an amenable number.

21342044461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342044461 is an equidigital number, since it uses as much as digits as its factorization.

21342044461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21342044461 its reverse (16444024312), we get a palindrome (37786068773).

The spelling of 21342044461 in words is "twenty-one billion, three hundred forty-two million, forty-four thousand, four hundred sixty-one".