221672071 has 2 divisors, whose sum is σ = 221672072. Its totient is φ = 221672070.

The previous prime is 221672051. The next prime is 221672081. The reversal of 221672071 is 170276122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221672071 - 2²³ = 213283463 is a prime.

It is a super-2 number, since 2×221672071² = 98277014122858082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221672021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110836035 + 110836036.

It is an arithmetic number, because the mean of its divisors is an integer number (110836036).

Almost surely, 2^221672071 is an apocalyptic number.

221672071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221672071 is an equidigital number, since it uses as much as digits as its factorization.

221672071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 221672071 is about 14888.6557821719. The cubic root of 221672071 is about 605.2066056656.

The spelling of 221672071 in words is "two hundred twenty-one million, six hundred seventy-two thousand, seventy-one".