21497045 has 8 divisors (see below), whose sum is σ = 25982880. Its totient is φ = 17073360.

The previous prime is 21497023. The next prime is 21497053. The reversal of 21497045 is 54079412.

It is a happy number.

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

It is not a de Polignac number, because 21497045 - 2¹² = 21492949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14771 + ... + 16160.

It is an arithmetic number, because the mean of its divisors is an integer number (3247860).

Almost surely, 2^21497045 is an apocalyptic number.

It is an amenable number.

21497045 is a deficient number, since it is larger than the sum of its proper divisors (4485835).

21497045 is a wasteful number, since it uses less digits than its factorization.

21497045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31075.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21497045 is about 4636.4905909535. The cubic root of 21497045 is about 278.0521484905.

The spelling of 21497045 in words is "twenty-one million, four hundred ninety-seven thousand, forty-five".