21147605744 has 20 divisors (see below), whose sum is σ = 42080878824. Its totient is φ = 10288024128.

The previous prime is 21147605741. The next prime is 21147605789. The reversal of 21147605744 is 44750674112.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147605741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17860562 + ... + 17861745.

Almost surely, 2^21147605744 is an apocalyptic number.

It is an amenable number.

21147605744 is a deficient number, since it is larger than the sum of its proper divisors (20933273080).

21147605744 is a wasteful number, since it uses less digits than its factorization.

21147605744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35722352 (or 35722346 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 21147605744 in words is "twenty-one billion, one hundred forty-seven million, six hundred five thousand, seven hundred forty-four".