21453143 has 2 divisors, whose sum is σ = 21453144. Its totient is φ = 21453142.

The previous prime is 21453119. The next prime is 21453191. The reversal of 21453143 is 34135412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21453143 - 2⁶ = 21453079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21453193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726571 + 10726572.

It is an arithmetic number, because the mean of its divisors is an integer number (10726572).

Almost surely, 2^21453143 is an apocalyptic number.

21453143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453143 is an equidigital number, since it uses as much as digits as its factorization.

21453143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 21453143 is about 4631.7537715211. The cubic root of 21453143 is about 277.8627369575.

Adding to 21453143 its reverse (34135412), we get a palindrome (55588555).

The spelling of 21453143 in words is "twenty-one million, four hundred fifty-three thousand, one hundred forty-three".