21403454 has 16 divisors (see below), whose sum is σ = 33601920. Its totient is φ = 10212480.

The previous prime is 21403441. The next prime is 21403463. The reversal of 21403454 is 45430412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2162 + ... + 6890.

It is an arithmetic number, because the mean of its divisors is an integer number (2100120).

Almost surely, 2^21403454 is an apocalyptic number.

21403454 is a deficient number, since it is larger than the sum of its proper divisors (12198466).

21403454 is a wasteful number, since it uses less digits than its factorization.

21403454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 21403454 is about 4626.3867110305. The cubic root of 21403454 is about 277.6480458853.

Adding to 21403454 its reverse (45430412), we get a palindrome (66833866).

The spelling of 21403454 in words is "twenty-one million, four hundred three thousand, four hundred fifty-four".