21701201 has 2 divisors, whose sum is σ = 21701202. Its totient is φ = 21701200.

The previous prime is 21701189. The next prime is 21701219. The reversal of 21701201 is 10210712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 678976 = 4585^2 + 824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21701201 - 2²² = 17506897 is a prime.

It is not a weakly prime, because it can be changed into another prime (21701261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850600 + 10850601.

It is an arithmetic number, because the mean of its divisors is an integer number (10850601).

Almost surely, 2^21701201 is an apocalyptic number.

It is an amenable number.

21701201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21701201 is an equidigital number, since it uses as much as digits as its factorization.

21701201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 21701201 is about 4658.4547867292. The cubic root of 21701201 is about 278.9295908796.

Adding to 21701201 its reverse (10210712), we get a palindrome (31911913).

The spelling of 21701201 in words is "twenty-one million, seven hundred one thousand, two hundred one".