21454045 has 8 divisors (see below), whose sum is σ = 25889760. Its totient is φ = 17066640.

The previous prime is 21454039. The next prime is 21454049. The reversal of 21454045 is 54045412.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21454045 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454049) 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, 11091 + ... + 12880.

It is an arithmetic number, because the mean of its divisors is an integer number (3236220).

Almost surely, 2^21454045 is an apocalyptic number.

It is an amenable number.

21454045 is a deficient number, since it is larger than the sum of its proper divisors (4435715).

21454045 is a wasteful number, since it uses less digits than its factorization.

21454045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24155.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 21454045 is about 4631.8511418222. The cubic root of 21454045 is about 277.8666311604.

Adding to 21454045 its reverse (54045412), we get a palindrome (75499457).

The spelling of 21454045 in words is "twenty-one million, four hundred fifty-four thousand, forty-five".