221012321069 has 2 divisors, whose sum is σ = 221012321070. Its totient is φ = 221012321068.

The previous prime is 221012321011. The next prime is 221012321081. The reversal of 221012321069 is 960123210122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191835240100 + 29177080969 = 437990^2 + 170813^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012321069 - 2⁸ = 221012320813 is a prime.

It is a super-2 number, since 2×221012321069² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012321009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506160534 + 110506160535.

It is an arithmetic number, because the mean of its divisors is an integer number (110506160535).

Almost surely, 2^221012321069 is an apocalyptic number.

It is an amenable number.

221012321069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012321069 is an equidigital number, since it uses as much as digits as its factorization.

221012321069 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 221012321069 in words is "two hundred twenty-one billion, twelve million, three hundred twenty-one thousand, sixty-nine".