21334621 has 8 divisors (see below), whose sum is σ = 26599104. Its totient is φ = 16624320.

The previous prime is 21334613. The next prime is 21334631. The reversal of 21334621 is 12643312.

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

It is a cyclic number.

It is not a de Polignac number, because 21334621 - 2³ = 21334613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21334592 and 21334601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138460 + ... + 138613.

It is an arithmetic number, because the mean of its divisors is an integer number (3324888).

Almost surely, 2^21334621 is an apocalyptic number.

It is an amenable number.

21334621 is a deficient number, since it is larger than the sum of its proper divisors (5264483).

21334621 is a wasteful number, since it uses less digits than its factorization.

21334621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277091.

The product of its digits is 864, while the sum is 22.

The square root of 21334621 is about 4618.9415454193. The cubic root of 21334621 is about 277.3500897417.

Adding to 21334621 its reverse (12643312), we get a palindrome (33977933).

The spelling of 21334621 in words is "twenty-one million, three hundred thirty-four thousand, six hundred twenty-one".