21011324 has 6 divisors (see below), whose sum is σ = 36769824. Its totient is φ = 10505660.

The previous prime is 21011317. The next prime is 21011327. The reversal of 21011324 is 42311012.

It is a junction number, because it is equal to n+sod(n) for n = 21011299 and 21011308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626412 + ... + 2626419.

It is an arithmetic number, because the mean of its divisors is an integer number (6128304).

Almost surely, 2^21011324 is an apocalyptic number.

It is an amenable number.

21011324 is a deficient number, since it is larger than the sum of its proper divisors (15758500).

21011324 is a wasteful number, since it uses less digits than its factorization.

21011324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252835 (or 5252833 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21011324 is about 4583.8110781314. The cubic root of 21011324 is about 275.9419992943.

Adding to 21011324 its reverse (42311012), we get a palindrome (63322336).

The spelling of 21011324 in words is "twenty-one million, eleven thousand, three hundred twenty-four".