21226001 has 2 divisors, whose sum is σ = 21226002. Its totient is φ = 21226000.

The previous prime is 21225989. The next prime is 21226019. The reversal of 21226001 is 10062212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 286225 = 4576^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21226001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21226091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613000 + 10613001.

It is an arithmetic number, because the mean of its divisors is an integer number (10613001).

Almost surely, 2^21226001 is an apocalyptic number.

It is an amenable number.

21226001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226001 is an equidigital number, since it uses as much as digits as its factorization.

21226001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21226001 is about 4607.1684362524. The cubic root of 21226001 is about 276.8786019842.

Adding to 21226001 its reverse (10062212), we get a palindrome (31288213).

The spelling of 21226001 in words is "twenty-one million, two hundred twenty-six thousand, one".