21751150 has 24 divisors (see below), whose sum is σ = 41765184. Its totient is φ = 8419200.

The previous prime is 21751139. The next prime is 21751157. The reversal of 21751150 is 5115712.

It is a super-2 number, since 2×21751150² = 946225052645000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5467 + ... + 8566.

It is an arithmetic number, because the mean of its divisors is an integer number (1740216).

Almost surely, 2^21751150 is an apocalyptic number.

21751150 is a deficient number, since it is larger than the sum of its proper divisors (20014034).

21751150 is a wasteful number, since it uses less digits than its factorization.

21751150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14076 (or 14071 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 21751150 is about 4663.8128178562. The cubic root of 21751150 is about 279.1434281787.

Adding to 21751150 its reverse (5115712), we get a palindrome (26866862).

The spelling of 21751150 in words is "twenty-one million, seven hundred fifty-one thousand, one hundred fifty".