21750070 has 8 divisors (see below), whose sum is σ = 39150144. Its totient is φ = 8700024.

The previous prime is 21750059. The next prime is 21750073. The reversal of 21750070 is 7005712.

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 (21750073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087494 + ... + 1087513.

It is an arithmetic number, because the mean of its divisors is an integer number (4893768).

Almost surely, 2^21750070 is an apocalyptic number.

21750070 is a deficient number, since it is larger than the sum of its proper divisors (17400074).

21750070 is a wasteful number, since it uses less digits than its factorization.

21750070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175014.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 21750070 is about 4663.6970313261. The cubic root of 21750070 is about 279.1388080415.

Adding to 21750070 its reverse (7005712), we get a palindrome (28755782).

The spelling of 21750070 in words is "twenty-one million, seven hundred fifty thousand, seventy".