21234454 has 8 divisors (see below), whose sum is σ = 32391720. Its totient is φ = 10437216.

The previous prime is 21234443. The next prime is 21234461. The reversal of 21234454 is 45443212.

It is a happy number.

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, 89859 + ... + 90094.

It is an arithmetic number, because the mean of its divisors is an integer number (4048965).

Almost surely, 2^21234454 is an apocalyptic number.

21234454 is a deficient number, since it is larger than the sum of its proper divisors (11157266).

21234454 is a wasteful number, since it uses less digits than its factorization.

21234454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180014.

The product of its digits is 3840, while the sum is 25.

The square root of 21234454 is about 4608.0857196888. The cubic root of 21234454 is about 276.9153516324.

Adding to 21234454 its reverse (45443212), we get a palindrome (66677666).

The spelling of 21234454 in words is "twenty-one million, two hundred thirty-four thousand, four hundred fifty-four".