21211150 has 12 divisors (see below), whose sum is σ = 39452832. Its totient is φ = 8484440.

The previous prime is 21211139. The next prime is 21211181. The reversal of 21211150 is 5111212.

It is a self number, because there is not a number n which added to its sum of digits gives 21211150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212062 + ... + 212161.

It is an arithmetic number, because the mean of its divisors is an integer number (3287736).

Almost surely, 2^21211150 is an apocalyptic number.

21211150 is a deficient number, since it is larger than the sum of its proper divisors (18241682).

21211150 is a wasteful number, since it uses less digits than its factorization.

21211150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424235 (or 424230 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 21211150 is about 4605.5564267524. The cubic root of 21211150 is about 276.8140132207.

Adding to 21211150 its reverse (5111212), we get a palindrome (26322362).

The spelling of 21211150 in words is "twenty-one million, two hundred eleven thousand, one hundred fifty".