21451130413 has 2 divisors, whose sum is σ = 21451130414. Its totient is φ = 21451130412.

The previous prime is 21451130317. The next prime is 21451130431. The reversal of 21451130413 is 31403115412.

Together with next prime (21451130431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18550984804 + 2900145609 = 136202^2 + 53853^2 .

It is a cyclic number.

It is not a de Polignac number, because 21451130413 - 2¹³ = 21451122221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21451131413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725565206 + 10725565207.

It is an arithmetic number, because the mean of its divisors is an integer number (10725565207).

Almost surely, 2^21451130413 is an apocalyptic number.

It is an amenable number.

21451130413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21451130413 is an equidigital number, since it uses as much as digits as its factorization.

21451130413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21451130413 its reverse (31403115412), we get a palindrome (52854245825).

The spelling of 21451130413 in words is "twenty-one billion, four hundred fifty-one million, one hundred thirty thousand, four hundred thirteen".