221142967 has 2 divisors, whose sum is σ = 221142968. Its totient is φ = 221142966.

The previous prime is 221142949. The next prime is 221142979. The reversal of 221142967 is 769241122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221142967 - 2¹¹ = 221140919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221142917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571483 + 110571484.

It is an arithmetic number, because the mean of its divisors is an integer number (110571484).

Almost surely, 2^221142967 is an apocalyptic number.

221142967 is a deficient number, since it is larger than the sum of its proper divisors (1).

221142967 is an equidigital number, since it uses as much as digits as its factorization.

221142967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 221142967 is about 14870.8764704707. The cubic root of 221142967 is about 604.7247041103.

The spelling of 221142967 in words is "two hundred twenty-one million, one hundred forty-two thousand, nine hundred sixty-seven".