1221100121071 has 2 divisors, whose sum is σ = 1221100121072. Its totient is φ = 1221100121070.

The previous prime is 1221100120979. The next prime is 1221100121077. The reversal of 1221100121071 is 1701210011221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221100121071 is a prime.

It is a super-2 number, since 2×1221100121071² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221100121077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550060535 + 610550060536.

It is an arithmetic number, because the mean of its divisors is an integer number (610550060536).

Almost surely, 2^{1221100121071} is an apocalyptic number.

1221100121071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100121071 is an equidigital number, since it uses as much as digits as its factorization.

1221100121071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 1221100121071 its reverse (1701210011221), we get a palindrome (2922310132292).

The spelling of 1221100121071 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, seventy-one".