1221100011847 has 2 divisors, whose sum is σ = 1221100011848. Its totient is φ = 1221100011846.

The previous prime is 1221100011823. The next prime is 1221100011881. The reversal of 1221100011847 is 7481100011221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100011847 - 2²³ = 1221091623239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221100011247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550005923 + 610550005924.

It is an arithmetic number, because the mean of its divisors is an integer number (610550005924).

Almost surely, 2^{1221100011847} is an apocalyptic number.

1221100011847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100011847 is an equidigital number, since it uses as much as digits as its factorization.

1221100011847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The spelling of 1221100011847 in words is "one trillion, two hundred twenty-one billion, one hundred million, eleven thousand, eight hundred forty-seven".