21254329 has 2 divisors, whose sum is σ = 21254330. Its totient is φ = 21254328.

The previous prime is 21254327. The next prime is 21254371. The reversal of 21254329 is 92345212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 570025 = 4548^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254329 - 2¹ = 21254327 is a prime.

Together with 21254327, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21254297 and 21254306.

It is not a weakly prime, because it can be changed into another prime (21254327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627164 + 10627165.

It is an arithmetic number, because the mean of its divisors is an integer number (10627165).

Almost surely, 2^21254329 is an apocalyptic number.

It is an amenable number.

21254329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254329 is an equidigital number, since it uses as much as digits as its factorization.

21254329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 21254329 is about 4610.2417507111. The cubic root of 21254329 is about 277.0017203297.

The spelling of 21254329 in words is "twenty-one million, two hundred fifty-four thousand, three hundred twenty-nine".