21404506067249 has 2 divisors, whose sum is σ = 21404506067250. Its totient is φ = 21404506067248.

The previous prime is 21404506067237. The next prime is 21404506067293. The reversal of 21404506067249 is 94276060540412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20010233958400 + 1394272108849 = 4473280^2 + 1180793^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404506067249 - 2²⁴ = 21404489290033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21404506067197 and 21404506067206.

It is not a weakly prime, because it can be changed into another prime (21404506061249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702253033624 + 10702253033625.

It is an arithmetic number, because the mean of its divisors is an integer number (10702253033625).

Almost surely, 2^{21404506067249} is an apocalyptic number.

It is an amenable number.

21404506067249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404506067249 is an equidigital number, since it uses as much as digits as its factorization.

21404506067249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 21404506067249 in words is "twenty-one trillion, four hundred four billion, five hundred six million, sixty-seven thousand, two hundred forty-nine".