21454201 has 4 divisors (see below), whose sum is σ = 22146304. Its totient is φ = 20762100.

The previous prime is 21454163. The next prime is 21454217. The reversal of 21454201 is 10245412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21454201 - 2¹⁷ = 21323129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346005 + ... + 346066.

It is an arithmetic number, because the mean of its divisors is an integer number (5536576).

Almost surely, 2^21454201 is an apocalyptic number.

It is an amenable number.

21454201 is a deficient number, since it is larger than the sum of its proper divisors (692103).

21454201 is an equidigital number, since it uses as much as digits as its factorization.

21454201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692102.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21454201 is about 4631.8679817111. The cubic root of 21454201 is about 277.8673046479.

Adding to 21454201 its reverse (10245412), we get a palindrome (31699613).

The spelling of 21454201 in words is "twenty-one million, four hundred fifty-four thousand, two hundred one".