21012326 has 8 divisors (see below), whose sum is σ = 31538160. Its totient is φ = 10499608.

The previous prime is 21012311. The next prime is 21012331. The reversal of 21012326 is 62321012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3695 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (3942270).

Almost surely, 2^21012326 is an apocalyptic number.

21012326 is a deficient number, since it is larger than the sum of its proper divisors (10525834).

21012326 is a wasteful number, since it uses less digits than its factorization.

21012326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21012326 is about 4583.9203745266. The cubic root of 21012326 is about 275.9463856511.

Adding to 21012326 its reverse (62321012), we get a palindrome (83333338).

The spelling of 21012326 in words is "twenty-one million, twelve thousand, three hundred twenty-six".