201021101202721 has 2 divisors, whose sum is σ = 201021101202722. Its totient is φ = 201021101202720.

The previous prime is 201021101202697. The next prime is 201021101202767. The reversal of 201021101202721 is 127202101120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151208560362721 + 49812540840000 = 12296689^2 + 7057800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021101202721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201021101202692 and 201021101202701.

It is not a weakly prime, because it can be changed into another prime (201021801202721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510550601360 + 100510550601361.

It is an arithmetic number, because the mean of its divisors is an integer number (100510550601361).

Almost surely, 2^{201021101202721} is an apocalyptic number.

It is an amenable number.

201021101202721 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021101202721 is an equidigital number, since it uses as much as digits as its factorization.

201021101202721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 201021101202721 its reverse (127202101120102), we get a palindrome (328223202322823).

The spelling of 201021101202721 in words is "two hundred one trillion, twenty-one billion, one hundred one million, two hundred two thousand, seven hundred twenty-one".