21211124 has 12 divisors (see below), whose sum is σ = 40494048. Its totient is φ = 9641400.

The previous prime is 21211109. The next prime is 21211139. The reversal of 21211124 is 42111212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21211109) and next prime (21211139).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211099 and 21211108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240992 + ... + 241079.

It is an arithmetic number, because the mean of its divisors is an integer number (3374504).

Almost surely, 2^21211124 is an apocalyptic number.

It is an amenable number.

21211124 is a deficient number, since it is larger than the sum of its proper divisors (19282924).

21211124 is a wasteful number, since it uses less digits than its factorization.

21211124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482086 (or 482084 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 21211124 is about 4605.5536040741. The cubic root of 21211124 is about 276.8139001172.

Adding to 21211124 its reverse (42111212), we get a palindrome (63322336).

The spelling of 21211124 in words is "twenty-one million, two hundred eleven thousand, one hundred twenty-four".