21086454 has 8 divisors (see below), whose sum is σ = 42172920. Its totient is φ = 7028816.

The previous prime is 21086453. The next prime is 21086467. The reversal of 21086454 is 45468012.

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

21086454 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1757199 + ... + 1757210.

It is an arithmetic number, because the mean of its divisors is an integer number (5271615).

Almost surely, 2^21086454 is an apocalyptic number.

21086454 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21086454 is a wasteful number, since it uses less digits than its factorization.

21086454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514414.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 21086454 is about 4591.9989111497. The cubic root of 21086454 is about 276.2705024948.

The spelling of 21086454 in words is "twenty-one million, eighty-six thousand, four hundred fifty-four".