53273717721 has 81 divisors (see below), whose sum is σ = 92952737631. Its totient is φ = 29314843488.

The previous prime is 53273717719. The next prime is 53273717789. The reversal of 53273717721 is 12771737235.

The square root of 53273717721 is 230811.

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

53273717721 is a `hidden beast` number, since 532 + 7 + 37 + 17 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27935445321 + 25338272400 = 167139^2 + 159180^2 .

It is not a de Polignac number, because 53273717721 - 2¹ = 53273717719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53273717221) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 140563710 + ... + 140564088.

Almost surely, 2^53273717721 is an apocalyptic number.

53273717721 is the 230811-st square number.

53273717721 is the 115406-th centered octagonal number.

It is an amenable number.

53273717721 is a deficient number, since it is larger than the sum of its proper divisors (39679019910).

53273717721 is an equidigital number, since it uses as much as digits as its factorization.

53273717721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 418 counting only the distinct ones).

The product of its digits is 432180, while the sum is 45.

The spelling of 53273717721 in words is "fifty-three billion, two hundred seventy-three million, seven hundred seventeen thousand, seven hundred twenty-one".