21060401 has 2 divisors, whose sum is σ = 21060402. Its totient is φ = 21060400.

The previous prime is 21060359. The next prime is 21060421. The reversal of 21060401 is 10406012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 5180176 = 3985^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 21060401 - 2¹⁰ = 21059377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21060421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530200 + 10530201.

It is an arithmetic number, because the mean of its divisors is an integer number (10530201).

Almost surely, 2^21060401 is an apocalyptic number.

It is an amenable number.

21060401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060401 is an equidigital number, since it uses as much as digits as its factorization.

21060401 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21060401 is about 4589.1612523423. The cubic root of 21060401 is about 276.1566752045.

Adding to 21060401 its reverse (10406012), we get a palindrome (31466413).

The spelling of 21060401 in words is "twenty-one million, sixty thousand, four hundred one".