21034345 has 8 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 16801200.

The previous prime is 21034331. The next prime is 21034357. The reversal of 21034345 is 54343012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21034345 - 2⁵ = 21034313 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670 + ... + 6520.

It is an arithmetic number, because the mean of its divisors is an integer number (3160080).

Almost surely, 2^21034345 is an apocalyptic number.

It is an amenable number.

21034345 is a deficient number, since it is larger than the sum of its proper divisors (4246295).

21034345 is an equidigital number, since it uses as much as digits as its factorization.

21034345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21034345 is about 4586.3215107535. The cubic root of 21034345 is about 276.0427408779.

Adding to 21034345 its reverse (54343012), we get a palindrome (75377357).

The spelling of 21034345 in words is "twenty-one million, thirty-four thousand, three hundred forty-five".