21750522 has 16 divisors (see below), whose sum is σ = 45001440. Its totient is φ = 7000112.

The previous prime is 21750503. The next prime is 21750523. The reversal of 21750522 is 22505712.

It is a junction number, because it is equal to n+sod(n) for n = 21750492 and 21750501.

It is not an unprimeable number, because it can be changed into a prime (21750523) 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, 62328 + ... + 62675.

It is an arithmetic number, because the mean of its divisors is an integer number (2812590).

Almost surely, 2^21750522 is an apocalyptic number.

21750522 is an abundant number, since it is smaller than the sum of its proper divisors (23250918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21750522 is a wasteful number, since it uses less digits than its factorization.

21750522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125037.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21750522 is about 4663.7454904829. The cubic root of 21750522 is about 279.1407416731.

The spelling of 21750522 in words is "twenty-one million, seven hundred fifty thousand, five hundred twenty-two".