21401326 has 4 divisors (see below), whose sum is σ = 32101992. Its totient is φ = 10700662.

The previous prime is 21401323. The next prime is 21401327. The reversal of 21401326 is 62310412.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350330 + ... + 5350333.

It is an arithmetic number, because the mean of its divisors is an integer number (8025498).

Almost surely, 2^21401326 is an apocalyptic number.

21401326 is a deficient number, since it is larger than the sum of its proper divisors (10700666).

21401326 is a wasteful number, since it uses less digits than its factorization.

21401326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700665.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21401326 is about 4626.1567202160. The cubic root of 21401326 is about 277.6388440275.

Adding to 21401326 its reverse (62310412), we get a palindrome (83711738).

The spelling of 21401326 in words is "twenty-one million, four hundred one thousand, three hundred twenty-six".