21750010 has 16 divisors (see below), whose sum is σ = 39274272. Its totient is φ = 8672400.

The previous prime is 21750007. The next prime is 21750011. The reversal of 21750010 is 1005712.

It is not an unprimeable number, because it can be changed into a prime (21750011) 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, 25 + ... + 6595.

It is an arithmetic number, because the mean of its divisors is an integer number (2454642).

Almost surely, 2^21750010 is an apocalyptic number.

21750010 is a deficient number, since it is larger than the sum of its proper divisors (17524262).

21750010 is a wasteful number, since it uses less digits than its factorization.

21750010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 21750010 is about 4663.6905986568. The cubic root of 21750010 is about 279.1385513628.

Adding to 21750010 its reverse (1005712), we get a palindrome (22755722).

The spelling of 21750010 in words is "twenty-one million, seven hundred fifty thousand, ten".