21750652 has 24 divisors (see below), whose sum is σ = 47456640. Its totient is φ = 8474160.

The previous prime is 21750629. The next prime is 21750661. The reversal of 21750652 is 25605712.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21750652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35002 + ... + 35617.

It is an arithmetic number, because the mean of its divisors is an integer number (1977360).

Almost surely, 2^21750652 is an apocalyptic number.

21750652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21750652 is an abundant number, since it is smaller than the sum of its proper divisors (25705988).

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

21750652 is a wasteful number, since it uses less digits than its factorization.

21750652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70641 (or 70639 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21750652 is about 4663.7594277578. The cubic root of 21750652 is about 279.1412978011.

The spelling of 21750652 in words is "twenty-one million, seven hundred fifty thousand, six hundred fifty-two".