21334212461 has 2 divisors, whose sum is σ = 21334212462. Its totient is φ = 21334212460.

The previous prime is 21334212443. The next prime is 21334212499. The reversal of 21334212461 is 16421243312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11147347561 + 10186864900 = 105581^2 + 100930^2 .

It is a cyclic number.

It is not a de Polignac number, because 21334212461 - 2¹⁸ = 21333950317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21334212421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667106230 + 10667106231.

It is an arithmetic number, because the mean of its divisors is an integer number (10667106231).

Almost surely, 2^21334212461 is an apocalyptic number.

It is an amenable number.

21334212461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334212461 is an equidigital number, since it uses as much as digits as its factorization.

21334212461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

Adding to 21334212461 its reverse (16421243312), we get a palindrome (37755455773).

The spelling of 21334212461 in words is "twenty-one billion, three hundred thirty-four million, two hundred twelve thousand, four hundred sixty-one".