21014069 has 2 divisors, whose sum is σ = 21014070. Its totient is φ = 21014068.

The previous prime is 21014047. The next prime is 21014087. The reversal of 21014069 is 96041012.

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., 16443025 + 4571044 = 4055^2 + 2138^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014069 - 2¹² = 21009973 is a prime.

It is a super-2 number, since 2×21014069² = 883182191873522, which contains 22 as substring.

It is equal to p_1330808 and since 21014069 and 1330808 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507034 + 10507035.

It is an arithmetic number, because the mean of its divisors is an integer number (10507035).

Almost surely, 2^21014069 is an apocalyptic number.

It is an amenable number.

21014069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014069 is an equidigital number, since it uses as much as digits as its factorization.

21014069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21014069 is about 4584.1104916876. The cubic root of 21014069 is about 275.9540154783.

The spelling of 21014069 in words is "twenty-one million, fourteen thousand, sixty-nine".