21010211069 has 2 divisors, whose sum is σ = 21010211070. Its totient is φ = 21010211068.

The previous prime is 21010211041. The next prime is 21010211083. The reversal of 21010211069 is 96011201012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18844425625 + 2165785444 = 137275^2 + 46538^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010211069 - 2⁸ = 21010210813 is a prime.

It is a super-2 number, since 2×21010211069² (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 (21010211009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505105534 + 10505105535.

It is an arithmetic number, because the mean of its divisors is an integer number (10505105535).

Almost surely, 2^21010211069 is an apocalyptic number.

It is an amenable number.

21010211069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010211069 is an equidigital number, since it uses as much as digits as its factorization.

21010211069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21010211069 in words is "twenty-one billion, ten million, two hundred eleven thousand, sixty-nine".