87203703721 has 2 divisors, whose sum is σ = 87203703722. Its totient is φ = 87203703720.

The previous prime is 87203703689. The next prime is 87203703737. The reversal of 87203703721 is 12730730278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75757057600 + 11446646121 = 275240^2 + 106989^2 .

It is a cyclic number.

It is not a de Polignac number, because 87203703721 - 2⁵ = 87203703689 is a prime.

It is not a weakly prime, because it can be changed into another prime (87203703751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43601851860 + 43601851861.

It is an arithmetic number, because the mean of its divisors is an integer number (43601851861).

Almost surely, 2^87203703721 is an apocalyptic number.

It is an amenable number.

87203703721 is a deficient number, since it is larger than the sum of its proper divisors (1).

87203703721 is an equidigital number, since it uses as much as digits as its factorization.

87203703721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 40.

The spelling of 87203703721 in words is "eighty-seven billion, two hundred three million, seven hundred three thousand, seven hundred twenty-one".