21111324 has 24 divisors (see below), whose sum is σ = 53049360. Its totient is φ = 6495744.

The previous prime is 21111301. The next prime is 21111373. The reversal of 21111324 is 42311112.

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

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, 67509 + ... + 67820.

It is an arithmetic number, because the mean of its divisors is an integer number (2210390).

Almost surely, 2^21111324 is an apocalyptic number.

It is an amenable number.

21111324 is an abundant number, since it is smaller than the sum of its proper divisors (31938036).

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

21111324 is a wasteful number, since it uses less digits than its factorization.

21111324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135349 (or 135347 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 21111324 is about 4594.7060841799. The cubic root of 21111324 is about 276.3790737437.

Adding to 21111324 its reverse (42311112), we get a palindrome (63422436).

The spelling of 21111324 in words is "twenty-one million, one hundred eleven thousand, three hundred twenty-four".