21413102849 has 2 divisors, whose sum is σ = 21413102850. Its totient is φ = 21413102848.

The previous prime is 21413102831. The next prime is 21413102863. The reversal of 21413102849 is 94820131412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18933760000 + 2479342849 = 137600^2 + 49793^2 .

It is a cyclic number.

It is not a de Polignac number, because 21413102849 - 2⁸ = 21413102593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21413102149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706551424 + 10706551425.

It is an arithmetic number, because the mean of its divisors is an integer number (10706551425).

Almost surely, 2^21413102849 is an apocalyptic number.

It is an amenable number.

21413102849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413102849 is an equidigital number, since it uses as much as digits as its factorization.

21413102849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21413102849 in words is "twenty-one billion, four hundred thirteen million, one hundred two thousand, eight hundred forty-nine".