21014221001 has 2 divisors, whose sum is σ = 21014221002. Its totient is φ = 21014221000.

The previous prime is 21014220949. The next prime is 21014221013. The reversal of 21014221001 is 10012241012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19667257600 + 1346963401 = 140240^2 + 36701^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014221001 - 2¹⁰ = 21014219977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21014221051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507110500 + 10507110501.

It is an arithmetic number, because the mean of its divisors is an integer number (10507110501).

Almost surely, 2^21014221001 is an apocalyptic number.

It is an amenable number.

21014221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014221001 is an equidigital number, since it uses as much as digits as its factorization.

21014221001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21014221001 its reverse (10012241012), we get a palindrome (31026462013).

The spelling of 21014221001 in words is "twenty-one billion, fourteen million, two hundred twenty-one thousand, one".