21351045 has 8 divisors (see below), whose sum is σ = 34161696. Its totient is φ = 11387216.

The previous prime is 21351017. The next prime is 21351053. The reversal of 21351045 is 54015312.

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

It is a cyclic number.

It is not a de Polignac number, because 21351045 - 2⁵ = 21351013 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 711687 + ... + 711716.

It is an arithmetic number, because the mean of its divisors is an integer number (4270212).

Almost surely, 2^21351045 is an apocalyptic number.

It is an amenable number.

21351045 is a deficient number, since it is larger than the sum of its proper divisors (12810651).

21351045 is a wasteful number, since it uses less digits than its factorization.

21351045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423411.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21351045 is about 4620.7190998805. The cubic root of 21351045 is about 277.4212421574.

Adding to 21351045 its reverse (54015312), we get a palindrome (75366357).

The spelling of 21351045 in words is "twenty-one million, three hundred fifty-one thousand, forty-five".