200102001721 has 2 divisors, whose sum is σ = 200102001722. Its totient is φ = 200102001720.

The previous prime is 200102001653. The next prime is 200102001769. The reversal of 200102001721 is 127100201002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192598977321 + 7503024400 = 438861^2 + 86620^2 .

It is a cyclic number.

It is not a de Polignac number, because 200102001721 - 2¹¹ = 200101999673 is a prime.

It is a super-2 number, since 2×200102001721² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 200102001695 and 200102001704.

It is not a weakly prime, because it can be changed into another prime (200102011721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100051000860 + 100051000861.

It is an arithmetic number, because the mean of its divisors is an integer number (100051000861).

Almost surely, 2^200102001721 is an apocalyptic number.

It is an amenable number.

200102001721 is a deficient number, since it is larger than the sum of its proper divisors (1).

200102001721 is an equidigital number, since it uses as much as digits as its factorization.

200102001721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 200102001721 its reverse (127100201002), we get a palindrome (327202202723).

The spelling of 200102001721 in words is "two hundred billion, one hundred two million, one thousand, seven hundred twenty-one".