221012927 has 2 divisors, whose sum is σ = 221012928. Its totient is φ = 221012926.

The previous prime is 221012923. The next prime is 221012929. The reversal of 221012927 is 729210122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221012927 - 2² = 221012923 is a prime.

It is a super-2 number, since 2×221012927² = 97693427802214658, which contains 22 as substring.

Together with 221012929, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221012896 and 221012905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506463 + 110506464.

It is an arithmetic number, because the mean of its divisors is an integer number (110506464).

Almost surely, 2^221012927 is an apocalyptic number.

221012927 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012927 is an equidigital number, since it uses as much as digits as its factorization.

221012927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 221012927 is about 14866.5035230211. The cubic root of 221012927 is about 604.6061475936.

The spelling of 221012927 in words is "two hundred twenty-one million, twelve thousand, nine hundred twenty-seven".