221012069 has 2 divisors, whose sum is σ = 221012070. Its totient is φ = 221012068.

The previous prime is 221012039. The next prime is 221012081. The reversal of 221012069 is 960210122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156000100 + 65011969 = 12490^2 + 8063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012069 is a prime.

It is a super-2 number, since 2×221012069² = 97692669287321522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_12175133 and since 221012069 and 12175133 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 (221012039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506034 + 110506035.

It is an arithmetic number, because the mean of its divisors is an integer number (110506035).

Almost surely, 2^221012069 is an apocalyptic number.

It is an amenable number.

221012069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012069 is an equidigital number, since it uses as much as digits as its factorization.

221012069 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 221012069 is about 14866.4746661742. The cubic root of 221012069 is about 604.6053652068.

The spelling of 221012069 in words is "two hundred twenty-one million, twelve thousand, sixty-nine".