21354461 has 4 divisors (see below), whose sum is σ = 22478400. Its totient is φ = 20230524.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354461 is 16445312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21354461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21354461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561941 + ... + 561978.

It is an arithmetic number, because the mean of its divisors is an integer number (5619600).

Almost surely, 2^21354461 is an apocalyptic number.

It is an amenable number.

21354461 is a deficient number, since it is larger than the sum of its proper divisors (1123939).

21354461 is a wasteful number, since it uses less digits than its factorization.

21354461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123938.

The product of its digits is 2880, while the sum is 26.

The square root of 21354461 is about 4621.0887245323. The cubic root of 21354461 is about 277.4360364439.

Adding to 21354461 its reverse (16445312), we get a palindrome (37799773).

The spelling of 21354461 in words is "twenty-one million, three hundred fifty-four thousand, four hundred sixty-one".