21322412 has 6 divisors (see below), whose sum is σ = 37314228. Its totient is φ = 10661204.

The previous prime is 21322391. The next prime is 21322417. The reversal of 21322412 is 21422312.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21322417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665298 + ... + 2665305.

It is an arithmetic number, because the mean of its divisors is an integer number (6219038).

Almost surely, 2^21322412 is an apocalyptic number.

It is an amenable number.

21322412 is a deficient number, since it is larger than the sum of its proper divisors (15991816).

21322412 is a wasteful number, since it uses less digits than its factorization.

21322412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330607 (or 5330605 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 21322412 is about 4617.6197331526. The cubic root of 21322412 is about 277.2971739767.

Adding to 21322412 its reverse (21422312), we get a palindrome (42744724).

The spelling of 21322412 in words is "twenty-one million, three hundred twenty-two thousand, four hundred twelve".