21484453 has 2 divisors, whose sum is σ = 21484454. Its totient is φ = 21484452.

The previous prime is 21484409. The next prime is 21484469. The reversal of 21484453 is 35448412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14424804 + 7059649 = 3798^2 + 2657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21484453 - 2⁹ = 21483941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21484403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742226 + 10742227.

It is an arithmetic number, because the mean of its divisors is an integer number (10742227).

Almost surely, 2^21484453 is an apocalyptic number.

It is an amenable number.

21484453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484453 is an equidigital number, since it uses as much as digits as its factorization.

21484453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 31.

The square root of 21484453 is about 4635.1324684414. The cubic root of 21484453 is about 277.9978477483.

The spelling of 21484453 in words is "twenty-one million, four hundred eighty-four thousand, four hundred fifty-three".