21034069 has 4 divisors (see below), whose sum is σ = 24038944. Its totient is φ = 18029196.

The previous prime is 21034067. The next prime is 21034129. The reversal of 21034069 is 96043012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21034069 - 2¹ = 21034067 is a prime.

It is a super-2 number, since 2×21034069² = 884864117393522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034061) 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 3 ways as a sum of consecutive naturals, for example, 1502427 + ... + 1502440.

It is an arithmetic number, because the mean of its divisors is an integer number (6009736).

Almost surely, 2^21034069 is an apocalyptic number.

It is an amenable number.

21034069 is a deficient number, since it is larger than the sum of its proper divisors (3004875).

21034069 is an equidigital number, since it uses as much as digits as its factorization.

21034069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004874.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21034069 is about 4586.2914211812. The cubic root of 21034069 is about 276.0415335171.

The spelling of 21034069 in words is "twenty-one million, thirty-four thousand, sixty-nine".