8049641421721 has 9 divisors (see below), whose sum is σ = 8148031895829. Its totient is φ = 7952425140636.

The previous prime is 8049641421707. The next prime is 8049641421761. The reversal of 8049641421721 is 1271241469408.

The square root of 8049641421721 is 2837189.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 8049641421721 - 2¹³ = 8049641413529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8049641421761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 235469596 + ... + 235503778.

Almost surely, 2^{8049641421721} is an apocalyptic number.

8049641421721 is the 2837189-th square number.

8049641421721 is the 1418595-th centered octagonal number.

It is an amenable number.

8049641421721 is a deficient number, since it is larger than the sum of its proper divisors (98390474108).

8049641421721 is an frugal number, since it uses more digits than its factorization.

8049641421721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68532 (or 34266 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

Multiplying 8049641421721 by its sum of digits (49), we get a square (394432429664329 = 19860323²).

The spelling of 8049641421721 in words is "eight trillion, forty-nine billion, six hundred forty-one million, four hundred twenty-one thousand, seven hundred twenty-one".