21200369 has 2 divisors, whose sum is σ = 21200370. Its totient is φ = 21200368.

The previous prime is 21200329. The next prime is 21200381. The reversal of 21200369 is 96300212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 1129969 = 4480^2 + 1063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200369 is a prime.

It is a super-2 number, since 2×21200369² = 898911291472322, which contains 22 as substring.

21200369 is a modest number, since divided by 369 gives 212 as remainder.

It is not a weakly prime, because it can be changed into another prime (21200329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600184 + 10600185.

It is an arithmetic number, because the mean of its divisors is an integer number (10600185).

Almost surely, 2^21200369 is an apocalyptic number.

It is an amenable number.

21200369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200369 is an equidigital number, since it uses as much as digits as its factorization.

21200369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21200369 is about 4604.3858439536. The cubic root of 21200369 is about 276.7671064817.

The spelling of 21200369 in words is "twenty-one million, two hundred thousand, three hundred sixty-nine".