21332426 has 4 divisors (see below), whose sum is σ = 31998642. Its totient is φ = 10666212.

The previous prime is 21332419. The next prime is 21332471. The reversal of 21332426 is 62423312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11566801 + 9765625 = 3401^2 + 3125^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333105 + ... + 5333108.

Almost surely, 2^21332426 is an apocalyptic number.

21332426 is a deficient number, since it is larger than the sum of its proper divisors (10666216).

21332426 is a wasteful number, since it uses less digits than its factorization.

21332426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666215.

The product of its digits is 1728, while the sum is 23.

The square root of 21332426 is about 4618.7039307581. The cubic root of 21332426 is about 277.3405777483.

Adding to 21332426 its reverse (62423312), we get a palindrome (83755738).

The spelling of 21332426 in words is "twenty-one million, three hundred thirty-two thousand, four hundred twenty-six".