21454136 has 32 divisors (see below), whose sum is σ = 46468080. Its totient is φ = 9177600.

The previous prime is 21454123. The next prime is 21454151. The reversal of 21454136 is 63145412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5675 + ... + 8666.

Almost surely, 2^21454136 is an apocalyptic number.

It is an amenable number.

21454136 is an abundant number, since it is smaller than the sum of its proper divisors (25013944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454136 is a wasteful number, since it uses less digits than its factorization.

21454136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14375 (or 14371 counting only the distinct ones).

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

The square root of 21454136 is about 4631.8609650982. The cubic root of 21454136 is about 277.8670240285.

Adding to 21454136 its reverse (63145412), we get a palindrome (84599548).

The spelling of 21454136 in words is "twenty-one million, four hundred fifty-four thousand, one hundred thirty-six".