21426201 has 20 divisors (see below), whose sum is σ = 32402832. Its totient is φ = 14107608.

The previous prime is 21426193. The next prime is 21426203. The reversal of 21426201 is 10262412.

21426201 is a `hidden beast` number, since 2 + 1 + 42 + 620 + 1 = 666.

It is not a de Polignac number, because 21426201 - 2³ = 21426193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21426203) 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 in 19 ways as a sum of consecutive naturals, for example, 5130 + ... + 8316.

Almost surely, 2^21426201 is an apocalyptic number.

It is an amenable number.

21426201 is a deficient number, since it is larger than the sum of its proper divisors (10976631).

21426201 is an equidigital number, since it uses as much as digits as its factorization.

21426201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282 (or 3273 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21426201 is about 4628.8444562331. The cubic root of 21426201 is about 277.7463699541.

Adding to 21426201 its reverse (10262412), we get a palindrome (31688613).

The spelling of 21426201 in words is "twenty-one million, four hundred twenty-six thousand, two hundred one".