21144208958 has 8 divisors (see below), whose sum is σ = 31719269952. Its totient is φ = 10571118976.

The previous prime is 21144208859. The next prime is 21144208961. The reversal of 21144208958 is 85980244112.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465635 + ... + 509022.

It is an arithmetic number, because the mean of its divisors is an integer number (3964908744).

Almost surely, 2^21144208958 is an apocalyptic number.

21144208958 is a deficient number, since it is larger than the sum of its proper divisors (10575060994).

21144208958 is a wasteful number, since it uses less digits than its factorization.

21144208958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985506.

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 21144208958 in words is "twenty-one billion, one hundred forty-four million, two hundred eight thousand, nine hundred fifty-eight".