221010001 has 2 divisors, whose sum is σ = 221010002. Its totient is φ = 221010000.

The previous prime is 221009983. The next prime is 221010011. The reversal of 221010001 is 100010122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196000000 + 25010001 = 14000^2 + 5001^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010001 - 2¹⁵ = 220977233 is a prime.

It is not a weakly prime, because it can be changed into another prime (221010011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505000 + 110505001.

It is an arithmetic number, because the mean of its divisors is an integer number (110505001).

Almost surely, 2^221010001 is an apocalyptic number.

It is an amenable number.

221010001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010001 is an equidigital number, since it uses as much as digits as its factorization.

221010001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 221010001 is about 14866.4051135438. The cubic root of 221010001 is about 604.6034794459.

Adding to 221010001 its reverse (100010122), we get a palindrome (321020123).

The spelling of 221010001 in words is "two hundred twenty-one million, ten thousand, one".