19221001 has 2 divisors, whose sum is σ = 19221002. Its totient is φ = 19221000.

The previous prime is 19220983. The next prime is 19221029. The reversal of 19221001 is 10012291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18481401 + 739600 = 4299^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 19221001 - 2²¹ = 17123849 is a prime.

It is not a weakly prime, because it can be changed into another prime (19221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9610500 + 9610501.

It is an arithmetic number, because the mean of its divisors is an integer number (9610501).

Almost surely, 2^19221001 is an apocalyptic number.

It is an amenable number.

19221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19221001 is an equidigital number, since it uses as much as digits as its factorization.

19221001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 19221001 is about 4384.1762054005. The cubic root of 19221001 is about 267.8707747458.

Adding to 19221001 its reverse (10012291), we get a palindrome (29233292).

The spelling of 19221001 in words is "nineteen million, two hundred twenty-one thousand, one".