1221201111029 has 2 divisors, whose sum is σ = 1221201111030. Its totient is φ = 1221201111028.

The previous prime is 1221201110999. The next prime is 1221201111047. The reversal of 1221201111029 is 9201111021221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115252163025 + 105948948004 = 1056055^2 + 325498^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221201111029 - 2²⁴ = 1221184333813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221201110995 and 1221201111013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221201111049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600555514 + 610600555515.

It is an arithmetic number, because the mean of its divisors is an integer number (610600555515).

Almost surely, 2^{1221201111029} is an apocalyptic number.

It is an amenable number.

1221201111029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201111029 is an equidigital number, since it uses as much as digits as its factorization.

1221201111029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1221201111029 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred eleven thousand, twenty-nine".