21012413069 has 2 divisors, whose sum is σ = 21012413070. Its totient is φ = 21012413068.

The previous prime is 21012413057. The next prime is 21012413077. The reversal of 21012413069 is 96031421012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17282257444 + 3730155625 = 131462^2 + 61075^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012413069 - 2⁴ = 21012413053 is a prime.

It is a super-2 number, since 2×21012413069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012413029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506206534 + 10506206535.

It is an arithmetic number, because the mean of its divisors is an integer number (10506206535).

Almost surely, 2^21012413069 is an apocalyptic number.

It is an amenable number.

21012413069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012413069 is an equidigital number, since it uses as much as digits as its factorization.

21012413069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21012413069 in words is "twenty-one billion, twelve million, four hundred thirteen thousand, sixty-nine".