1221100012127 has 2 divisors, whose sum is σ = 1221100012128. Its totient is φ = 1221100012126.

The previous prime is 1221100012103. The next prime is 1221100012133. The reversal of 1221100012127 is 7212100011221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100012127 - 2¹⁴ = 1221099995743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221100012099 and 1221100012108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221100912127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550006063 + 610550006064.

It is an arithmetic number, because the mean of its divisors is an integer number (610550006064).

Almost surely, 2^{1221100012127} is an apocalyptic number.

1221100012127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100012127 is an equidigital number, since it uses as much as digits as its factorization.

1221100012127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1221100012127 its reverse (7212100011221), we get a palindrome (8433200023348).

The spelling of 1221100012127 in words is "one trillion, two hundred twenty-one billion, one hundred million, twelve thousand, one hundred twenty-seven".