2221251001 has 2 divisors, whose sum is σ = 2221251002. Its totient is φ = 2221251000.

The previous prime is 2221250987. The next prime is 2221251023. The reversal of 2221251001 is 1001521222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2012419600 + 208831401 = 44860^2 + 14451^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221251001 - 2¹³ = 2221242809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221258001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110625500 + 1110625501.

It is an arithmetic number, because the mean of its divisors is an integer number (1110625501).

Almost surely, 2^2221251001 is an apocalyptic number.

It is an amenable number.

2221251001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221251001 is an equidigital number, since it uses as much as digits as its factorization.

2221251001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2221251001 is about 47130.1495966223. The cubic root of 2221251001 is about 1304.7657425603.

Adding to 2221251001 its reverse (1001521222), we get a palindrome (3222772223).

The spelling of 2221251001 in words is "two billion, two hundred twenty-one million, two hundred fifty-one thousand, one".