1021221100201 has 2 divisors, whose sum is σ = 1021221100202. Its totient is φ = 1021221100200.

The previous prime is 1021221100199. The next prime is 1021221100217. The reversal of 1021221100201 is 1020011221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540901411600 + 480319688601 = 735460^2 + 693051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021221100201 - 2¹ = 1021221100199 is a prime.

Together with 1021221100199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1021221100901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610550100 + 510610550101.

It is an arithmetic number, because the mean of its divisors is an integer number (510610550101).

Almost surely, 2^{1021221100201} is an apocalyptic number.

It is an amenable number.

1021221100201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221100201 is an equidigital number, since it uses as much as digits as its factorization.

1021221100201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021221100201 its reverse (1020011221201), we get a palindrome (2041232321402).

The spelling of 1021221100201 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred thousand, two hundred one".