21761150 has 12 divisors (see below), whose sum is σ = 40475832. Its totient is φ = 8704440.

The previous prime is 21761093. The next prime is 21761153. The reversal of 21761150 is 5116712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217562 + ... + 217661.

It is an arithmetic number, because the mean of its divisors is an integer number (3372986).

Almost surely, 2^21761150 is an apocalyptic number.

21761150 is a deficient number, since it is larger than the sum of its proper divisors (18714682).

21761150 is a wasteful number, since it uses less digits than its factorization.

21761150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435235 (or 435230 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 21761150 is about 4664.8847788557. The cubic root of 21761150 is about 279.1861999649.

Adding to 21761150 its reverse (5116712), we get a palindrome (26877862).

The spelling of 21761150 in words is "twenty-one million, seven hundred sixty-one thousand, one hundred fifty".