21646555543142 has 8 divisors (see below), whose sum is σ = 32469931738776. Its totient is φ = 10823244963552.

The previous prime is 21646555543139. The next prime is 21646555543163. The reversal of 21646555543142 is 24134555564612.

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, 15570803 + ... + 16903934.

It is an arithmetic number, because the mean of its divisors is an integer number (4058741467347).

Almost surely, 2^{21646555543142} is an apocalyptic number.

21646555543142 is a deficient number, since it is larger than the sum of its proper divisors (10823376195634).

21646555543142 is a wasteful number, since it uses less digits than its factorization.

21646555543142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32808022.

The product of its digits is 17280000, while the sum is 53.

The spelling of 21646555543142 in words is "twenty-one trillion, six hundred forty-six billion, five hundred fifty-five million, five hundred forty-three thousand, one hundred forty-two".