21446545 has 8 divisors (see below), whose sum is σ = 25977024. Its totient is φ = 16996464.

The previous prime is 21446539. The next prime is 21446549. The reversal of 21446545 is 54564412.

It is a happy number.

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 21446545 - 2⁷ = 21446417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446549) 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, 19509 + ... + 20578.

It is an arithmetic number, because the mean of its divisors is an integer number (3247128).

Almost surely, 2^21446545 is an apocalyptic number.

It is an amenable number.

21446545 is a deficient number, since it is larger than the sum of its proper divisors (4530479).

21446545 is a wasteful number, since it uses less digits than its factorization.

21446545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40199.

The product of its digits is 19200, while the sum is 31.

The square root of 21446545 is about 4631.0414595423. The cubic root of 21446545 is about 277.8342481044.

The spelling of 21446545 in words is "twenty-one million, four hundred forty-six thousand, five hundred forty-five".