21336715069 has 2 divisors, whose sum is σ = 21336715070. Its totient is φ = 21336715068.

The previous prime is 21336715039. The next prime is 21336715097. The reversal of 21336715069 is 96051763312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17184588100 + 4152126969 = 131090^2 + 64437^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336715069 - 2¹⁹ = 21336190781 is a prime.

It is a super-2 number, since 2×21336715069² (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 (21336715009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668357534 + 10668357535.

It is an arithmetic number, because the mean of its divisors is an integer number (10668357535).

Almost surely, 2^21336715069 is an apocalyptic number.

It is an amenable number.

21336715069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336715069 is an equidigital number, since it uses as much as digits as its factorization.

21336715069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 21336715069 in words is "twenty-one billion, three hundred thirty-six million, seven hundred fifteen thousand, sixty-nine".