21201324 has 24 divisors (see below), whose sum is σ = 50523648. Its totient is φ = 6916560.

The previous prime is 21201311. The next prime is 21201347. The reversal of 21201324 is 42310212.

It is a super-2 number, since 2×21201324² = 898992278705952, which contains 22 as substring.

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, 18232 + ... + 19359.

It is an arithmetic number, because the mean of its divisors is an integer number (2105152).

Almost surely, 2^21201324 is an apocalyptic number.

It is an amenable number.

21201324 is an abundant number, since it is smaller than the sum of its proper divisors (29322324).

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

21201324 is a wasteful number, since it uses less digits than its factorization.

21201324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37645 (or 37643 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21201324 is about 4604.4895482561. The cubic root of 21201324 is about 276.7712622052.

Adding to 21201324 its reverse (42310212), we get a palindrome (63511536).

The spelling of 21201324 in words is "twenty-one million, two hundred one thousand, three hundred twenty-four".