1221302101 has 2 divisors, whose sum is σ = 1221302102. Its totient is φ = 1221302100.

The previous prime is 1221302099. The next prime is 1221302119. The reversal of 1221302101 is 1012031221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095279025 + 126023076 = 33095^2 + 11226^2 .

It is an emirp because it is prime and its reverse (1012031221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221302101 - 2¹ = 1221302099 is a prime.

Together with 1221302099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221302171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610651050 + 610651051.

It is an arithmetic number, because the mean of its divisors is an integer number (610651051).

Almost surely, 2^1221302101 is an apocalyptic number.

It is an amenable number.

1221302101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221302101 is an equidigital number, since it uses as much as digits as its factorization.

1221302101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221302101 is about 34947.1329439197. The cubic root of 1221302101 is about 1068.9097407869.

Adding to 1221302101 its reverse (1012031221), we get a palindrome (2233333322).

The spelling of 1221302101 in words is "one billion, two hundred twenty-one million, three hundred two thousand, one hundred one".