1221110061547 has 2 divisors, whose sum is σ = 1221110061548. Its totient is φ = 1221110061546.

The previous prime is 1221110061443. The next prime is 1221110061551. The reversal of 1221110061547 is 7451600111221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221110061547 - 2³⁵ = 1186750323179 is a prime.

It is a super-2 number, since 2×1221110061547² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221110065547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610555030773 + 610555030774.

It is an arithmetic number, because the mean of its divisors is an integer number (610555030774).

Almost surely, 2^{1221110061547} is an apocalyptic number.

1221110061547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221110061547 is an equidigital number, since it uses as much as digits as its factorization.

1221110061547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 1221110061547 its reverse (7451600111221), we get a palindrome (8672710172768).

The spelling of 1221110061547 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, sixty-one thousand, five hundred forty-seven".