21547070 has 8 divisors (see below), whose sum is σ = 38784744. Its totient is φ = 8618824.

The previous prime is 21547063. The next prime is 21547073. The reversal of 21547070 is 7074512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21547073) 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 3 ways as a sum of consecutive naturals, for example, 1077344 + ... + 1077363.

It is an arithmetic number, because the mean of its divisors is an integer number (4848093).

Almost surely, 2^21547070 is an apocalyptic number.

21547070 is a deficient number, since it is larger than the sum of its proper divisors (17237674).

21547070 is a wasteful number, since it uses less digits than its factorization.

21547070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154714.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21547070 is about 4641.8821613652. The cubic root of 21547070 is about 278.2676631218.

The spelling of 21547070 in words is "twenty-one million, five hundred forty-seven thousand, seventy".