1221093510947 has 2 divisors, whose sum is σ = 1221093510948. Its totient is φ = 1221093510946.

The previous prime is 1221093510929. The next prime is 1221093511019. The reversal of 1221093510947 is 7490153901221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221093510947 - 2⁶ = 1221093510883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221093510898 and 1221093510907.

It is not a weakly prime, because it can be changed into another prime (1221093513947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610546755473 + 610546755474.

It is an arithmetic number, because the mean of its divisors is an integer number (610546755474).

Almost surely, 2^{1221093510947} is an apocalyptic number.

1221093510947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221093510947 is an equidigital number, since it uses as much as digits as its factorization.

1221093510947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 1221093510947 in words is "one trillion, two hundred twenty-one billion, ninety-three million, five hundred ten thousand, nine hundred forty-seven".