21369069 has 8 divisors (see below), whose sum is σ = 31657920. Its totient is φ = 14246028.

The previous prime is 21369059. The next prime is 21369109. The reversal of 21369069 is 96096312.

It is not a de Polignac number, because 21369069 - 2⁵ = 21369037 is a prime.

It is a super-2 number, since 2×21369069² = 913274219853522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395697 + ... + 395750.

It is an arithmetic number, because the mean of its divisors is an integer number (3957240).

Almost surely, 2^21369069 is an apocalyptic number.

It is an amenable number.

21369069 is a deficient number, since it is larger than the sum of its proper divisors (10288851).

21369069 is an equidigital number, since it uses as much as digits as its factorization.

21369069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791456 (or 791450 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 21369069 is about 4622.6690342269. The cubic root of 21369069 is about 277.4992841472.

The spelling of 21369069 in words is "twenty-one million, three hundred sixty-nine thousand, sixty-nine".