21343201 has 16 divisors (see below), whose sum is σ = 23905728. Its totient is φ = 18892800.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343201 is 10234312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21343201 - 2¹⁵ = 21310433 is a prime.

21343201 is a modest number, since divided by 3201 gives 2134 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21343261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88441 + ... + 88681.

It is an arithmetic number, because the mean of its divisors is an integer number (1494108).

Almost surely, 2^21343201 is an apocalyptic number.

It is an amenable number.

21343201 is a deficient number, since it is larger than the sum of its proper divisors (2562527).

21343201 is a wasteful number, since it uses less digits than its factorization.

21343201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21343201 is about 4619.8702362729. The cubic root of 21343201 is about 277.3872647610.

Adding to 21343201 its reverse (10234312), we get a palindrome (31577513).

Subtracting from 21343201 its reverse (10234312), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2134 and 3201, that added together give a palindrome (5335).

The spelling of 21343201 in words is "twenty-one million, three hundred forty-three thousand, two hundred one".