21005543514 has 8 divisors (see below), whose sum is σ = 42011087040. Its totient is φ = 7001847836.

The previous prime is 21005543459. The next prime is 21005543521. The reversal of 21005543514 is 41534550012.

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

21005543514 is an admirable number.

It is a Curzon 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, 1750461954 + ... + 1750461965.

It is an arithmetic number, because the mean of its divisors is an integer number (5251385880).

Almost surely, 2^21005543514 is an apocalyptic number.

21005543514 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.

21005543514 is a wasteful number, since it uses less digits than its factorization.

21005543514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500923924.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21005543514 in words is "twenty-one billion, five million, five hundred forty-three thousand, five hundred fourteen".