60724721821 has 4 divisors (see below), whose sum is σ = 60857599132. Its totient is φ = 60591844512.

The previous prime is 60724721797. The next prime is 60724721833. The reversal of 60724721821 is 12812742706.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41233769721 + 19490952100 = 203061^2 + 139610^2 .

It is a cyclic number.

It is not a de Polignac number, because 60724721821 - 2²³ = 60716333213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60724721521) 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, 66437970 + ... + 66438883.

It is an arithmetic number, because the mean of its divisors is an integer number (15214399783).

Almost surely, 2^60724721821 is an apocalyptic number.

It is an amenable number.

60724721821 is a deficient number, since it is larger than the sum of its proper divisors (132877311).

60724721821 is a wasteful number, since it uses less digits than its factorization.

60724721821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132877310.

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 60724721821 in words is "sixty billion, seven hundred twenty-four million, seven hundred twenty-one thousand, eight hundred twenty-one".