21220010024849 has 2 divisors, whose sum is σ = 21220010024850. Its totient is φ = 21220010024848.

The previous prime is 21220010024839. The next prime is 21220010024881. The reversal of 21220010024849 is 94842001002212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19941002836225 + 1279007188624 = 4465535^2 + 1130932^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220010024849 - 2³² = 21215715057553 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220010024839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610005012424 + 10610005012425.

It is an arithmetic number, because the mean of its divisors is an integer number (10610005012425).

Almost surely, 2^{21220010024849} is an apocalyptic number.

It is an amenable number.

21220010024849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220010024849 is an equidigital number, since it uses as much as digits as its factorization.

21220010024849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 21220010024849 in words is "twenty-one trillion, two hundred twenty billion, ten million, twenty-four thousand, eight hundred forty-nine".