21511648614 has 32 divisors (see below), whose sum is σ = 44626944384. Its totient is φ = 6907844160.

The previous prime is 21511648607. The next prime is 21511648643. The reversal of 21511648614 is 41684611512.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552252 + ... + 589919.

It is an arithmetic number, because the mean of its divisors is an integer number (1394592012).

Almost surely, 2^21511648614 is an apocalyptic number.

21511648614 is an abundant number, since it is smaller than the sum of its proper divisors (23115295770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21511648614 is a wasteful number, since it uses less digits than its factorization.

21511648614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142292.

The product of its digits is 46080, while the sum is 39.

The spelling of 21511648614 in words is "twenty-one billion, five hundred eleven million, six hundred forty-eight thousand, six hundred fourteen".