221199001 has 2 divisors, whose sum is σ = 221199002. Its totient is φ = 221199000.

The previous prime is 221198983. The next prime is 221199101. The reversal of 221199001 is 100991122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 20693401 = 14160^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 221199001 - 2¹¹ = 221196953 is a prime.

It is not a weakly prime, because it can be changed into another prime (221199101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110599500 + 110599501.

It is an arithmetic number, because the mean of its divisors is an integer number (110599501).

Almost surely, 2^221199001 is an apocalyptic number.

It is an amenable number.

221199001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221199001 is an equidigital number, since it uses as much as digits as its factorization.

221199001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 221199001 is about 14872.7603692119. The cubic root of 221199001 is about 604.7757755702.

The spelling of 221199001 in words is "two hundred twenty-one million, one hundred ninety-nine thousand, one".