1220121011611 has 2 divisors, whose sum is σ = 1220121011612. Its totient is φ = 1220121011610.

The previous prime is 1220121011597. The next prime is 1220121011671. The reversal of 1220121011611 is 1161101210221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220121011611 - 2²⁹ = 1219584140699 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220121011671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060505805 + 610060505806.

It is an arithmetic number, because the mean of its divisors is an integer number (610060505806).

Almost surely, 2^{1220121011611} is an apocalyptic number.

1220121011611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121011611 is an equidigital number, since it uses as much as digits as its factorization.

1220121011611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 1220121011611 its reverse (1161101210221), we get a palindrome (2381222221832).

The spelling of 1220121011611 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, eleven thousand, six hundred eleven".