72032400721 has 2 divisors, whose sum is σ = 72032400722. Its totient is φ = 72032400720.

The previous prime is 72032400709. The next prime is 72032400733. The reversal of 72032400721 is 12700423027.

It is a balanced prime because it is at equal distance from previous prime (72032400709) and next prime (72032400733).

It can be written as a sum of positive squares in only one way, i.e., 55903400721 + 16129000000 = 236439^2 + 127000^2 .

It is an emirp because it is prime and its reverse (12700423027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72032400721 - 2¹³ = 72032392529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72032400721.

It is not a weakly prime, because it can be changed into another prime (72032400701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36016200360 + 36016200361.

It is an arithmetic number, because the mean of its divisors is an integer number (36016200361).

Almost surely, 2^72032400721 is an apocalyptic number.

It is an amenable number.

72032400721 is a deficient number, since it is larger than the sum of its proper divisors (1).

72032400721 is an equidigital number, since it uses as much as digits as its factorization.

72032400721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

Adding to 72032400721 its reverse (12700423027), we get a palindrome (84732823748).

The spelling of 72032400721 in words is "seventy-two billion, thirty-two million, four hundred thousand, seven hundred twenty-one".