21445154 has 16 divisors (see below), whose sum is σ = 33887808. Its totient is φ = 10158192.

The previous prime is 21445147. The next prime is 21445157. The reversal of 21445154 is 45154412.

It is not an unprimeable number, because it can be changed into a prime (21445157) by changing a digit.

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, 2744 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (2117988).

Almost surely, 2^21445154 is an apocalyptic number.

21445154 is a deficient number, since it is larger than the sum of its proper divisors (12442654).

21445154 is a wasteful number, since it uses less digits than its factorization.

21445154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489.

The product of its digits is 3200, while the sum is 26.

The square root of 21445154 is about 4630.8912749059. The cubic root of 21445154 is about 277.8282412970.

Adding to 21445154 its reverse (45154412), we get a palindrome (66599566).

The spelling of 21445154 in words is "twenty-one million, four hundred forty-five thousand, one hundred fifty-four".