2723640402221 has 4 divisors (see below), whose sum is σ = 2723686301052. Its totient is φ = 2723594503392.

The previous prime is 2723640402209. The next prime is 2723640402227. The reversal of 2723640402221 is 1222040463272.

2723640402221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1532953515625 + 1190686886596 = 1238125^2 + 1091186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2723640402221 is a prime.

It is a super-2 number, since 2×2723640402221² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2723640402227) 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, 22860290 + ... + 22979123.

It is an arithmetic number, because the mean of its divisors is an integer number (680921575263).

Almost surely, 2^{2723640402221} is an apocalyptic number.

It is an amenable number.

2723640402221 is a deficient number, since it is larger than the sum of its proper divisors (45898831).

2723640402221 is an equidigital number, since it uses as much as digits as its factorization.

2723640402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45898830.

The product of its (nonzero) digits is 64512, while the sum is 35.

Adding to 2723640402221 its reverse (1222040463272), we get a palindrome (3945680865493).

The spelling of 2723640402221 in words is "two trillion, seven hundred twenty-three billion, six hundred forty million, four hundred two thousand, two hundred twenty-one".