21347469 has 80 divisors (see below), whose sum is σ = 39842880. Its totient is φ = 11197440.

The previous prime is 21347467. The next prime is 21347533. The reversal of 21347469 is 96474312.

It is not a de Polignac number, because 21347469 - 2¹ = 21347467 is a prime.

It is a super-2 number, since 2×21347469² = 911428865411922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 220029 + ... + 220125.

It is an arithmetic number, because the mean of its divisors is an integer number (498036).

Almost surely, 2^21347469 is an apocalyptic number.

It is an amenable number.

21347469 is a deficient number, since it is larger than the sum of its proper divisors (18495411).

21347469 is a wasteful number, since it uses less digits than its factorization.

21347469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 143 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21347469 is about 4620.3321309187. The cubic root of 21347469 is about 277.4057532395.

The spelling of 21347469 in words is "twenty-one million, three hundred forty-seven thousand, four hundred sixty-nine".