21070750 has 32 divisors (see below), whose sum is σ = 39929760. Its totient is φ = 8324800.

The previous prime is 21070747. The next prime is 21070757. The reversal of 21070750 is 5707012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070757) 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 15 ways as a sum of consecutive naturals, for example, 21777 + ... + 22723.

It is an arithmetic number, because the mean of its divisors is an integer number (1247805).

Almost surely, 2^21070750 is an apocalyptic number.

21070750 is a deficient number, since it is larger than the sum of its proper divisors (18859010).

21070750 is an equidigital number, since it uses as much as digits as its factorization.

21070750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1043 counting only the distinct ones).

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

The square root of 21070750 is about 4590.2886619471. The cubic root of 21070750 is about 276.2019019064.

Adding to 21070750 its reverse (5707012), we get a palindrome (26777762).

The spelling of 21070750 in words is "twenty-one million, seventy thousand, seven hundred fifty".