53244641721 has 16 divisors (see below), whose sum is σ = 71448436800. Its totient is φ = 35268965568.

The previous prime is 53244641717. The next prime is 53244641731. The reversal of 53244641721 is 12714644235.

It is not a de Polignac number, because 53244641721 - 2² = 53244641717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53244641721.

It is not an unprimeable number, because it can be changed into a prime (53244641731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619635 + ... + 700311.

It is an arithmetic number, because the mean of its divisors is an integer number (4465527300).

Almost surely, 2^53244641721 is an apocalyptic number.

It is an amenable number.

53244641721 is a deficient number, since it is larger than the sum of its proper divisors (18203795079).

53244641721 is a wasteful number, since it uses less digits than its factorization.

53244641721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82088.

The product of its digits is 161280, while the sum is 39.

The spelling of 53244641721 in words is "fifty-three billion, two hundred forty-four million, six hundred forty-one thousand, seven hundred twenty-one".