21034045 has 8 divisors (see below), whose sum is σ = 26569440. Its totient is φ = 15941520.

The previous prime is 21034043. The next prime is 21034061. The reversal of 21034045 is 54043012.

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

It is not a de Polignac number, because 21034045 - 2¹ = 21034043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110611 + ... + 110800.

It is an arithmetic number, because the mean of its divisors is an integer number (3321180).

Almost surely, 2^21034045 is an apocalyptic number.

It is an amenable number.

21034045 is a deficient number, since it is larger than the sum of its proper divisors (5535395).

21034045 is a wasteful number, since it uses less digits than its factorization.

21034045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221435.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21034045 is about 4586.2888046873. The cubic root of 21034045 is about 276.0414285287.

Adding to 21034045 its reverse (54043012), we get a palindrome (75077057).

The spelling of 21034045 in words is "twenty-one million, thirty-four thousand, forty-five".