21455354654 has 8 divisors (see below), whose sum is σ = 32501676168. Its totient is φ = 10621462600.

The previous prime is 21455354647. The next prime is 21455354671. The reversal of 21455354654 is 45645355412.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53107112 + ... + 53107515.

It is an arithmetic number, because the mean of its divisors is an integer number (4062709521).

Almost surely, 2^21455354654 is an apocalyptic number.

21455354654 is a deficient number, since it is larger than the sum of its proper divisors (11046321514).

21455354654 is a wasteful number, since it uses less digits than its factorization.

21455354654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106214730.

The product of its digits is 1440000, while the sum is 44.

The spelling of 21455354654 in words is "twenty-one billion, four hundred fifty-five million, three hundred fifty-four thousand, six hundred fifty-four".