1221102210101 has 2 divisors, whose sum is σ = 1221102210102. Its totient is φ = 1221102210100.

The previous prime is 1221102210061. The next prime is 1221102210113. The reversal of 1221102210101 is 1010122011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138115580625 + 82986629476 = 1066825^2 + 288074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221102210101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102210121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551105050 + 610551105051.

It is an arithmetic number, because the mean of its divisors is an integer number (610551105051).

Almost surely, 2^{1221102210101} is an apocalyptic number.

It is an amenable number.

1221102210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102210101 is an equidigital number, since it uses as much as digits as its factorization.

1221102210101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221102210101 its reverse (1010122011221), we get a palindrome (2231224221322).

The spelling of 1221102210101 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred ten thousand, one hundred one".