21487654 has 8 divisors (see below), whose sum is σ = 32544720. Its totient is φ = 10639416.

The previous prime is 21487597. The next prime is 21487667. The reversal of 21487654 is 45678412.

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 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, 51949 + ... + 52360.

It is an arithmetic number, because the mean of its divisors is an integer number (4068090).

Almost surely, 2^21487654 is an apocalyptic number.

21487654 is a deficient number, since it is larger than the sum of its proper divisors (11057066).

21487654 is a wasteful number, since it uses less digits than its factorization.

21487654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104414.

The product of its digits is 53760, while the sum is 37.

The square root of 21487654 is about 4635.4777531555. The cubic root of 21487654 is about 278.0116534977.

The spelling of 21487654 in words is "twenty-one million, four hundred eighty-seven thousand, six hundred fifty-four".