21445054 has 4 divisors (see below), whose sum is σ = 32167584. Its totient is φ = 10722526.

The previous prime is 21445037. The next prime is 21445111. The reversal of 21445054 is 45054412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361262 + ... + 5361265.

It is an arithmetic number, because the mean of its divisors is an integer number (8041896).

Almost surely, 2^21445054 is an apocalyptic number.

21445054 is a deficient number, since it is larger than the sum of its proper divisors (10722530).

21445054 is a wasteful number, since it uses less digits than its factorization.

21445054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722529.

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

The square root of 21445054 is about 4630.8804778357. The cubic root of 21445054 is about 277.8278094532.

Adding to 21445054 its reverse (45054412), we get a palindrome (66499466).

The spelling of 21445054 in words is "twenty-one million, four hundred forty-five thousand, fifty-four".