21267049 has 2 divisors, whose sum is σ = 21267050. Its totient is φ = 21267048.

The previous prime is 21267047. The next prime is 21267053. The reversal of 21267049 is 94076212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 8450649 = 3580^2 + 2907^2 .

It is a cyclic number.

It is not a de Polignac number, because 21267049 - 2¹ = 21267047 is a prime.

Together with 21267047, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21267049.

It is not a weakly prime, because it can be changed into another prime (21267041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10633524 + 10633525.

It is an arithmetic number, because the mean of its divisors is an integer number (10633525).

Almost surely, 2^21267049 is an apocalyptic number.

It is an amenable number.

21267049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21267049 is an equidigital number, since it uses as much as digits as its factorization.

21267049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21267049 is about 4611.6210815721. The cubic root of 21267049 is about 277.0569680430.

The spelling of 21267049 in words is "twenty-one million, two hundred sixty-seven thousand, forty-nine".