121111120022021 has 6 divisors (see below), whose sum is σ = 125143956485766. Its totient is φ = 117204309697800.

The previous prime is 121111120021987. The next prime is 121111120022023. The reversal of 121111120022021 is 120220021111121.

It can be written as a sum of positive squares in only one way, i.e., 95912426793121 + 25198693228900 = 9793489^2 + 5019830^2 .

It is not a de Polignac number, because 121111120022021 - 2²² = 121111115827717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111120022023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63013068770 + ... + 63013070691.

It is an arithmetic number, because the mean of its divisors is an integer number (20857326080961).

Almost surely, 2^{121111120022021} is an apocalyptic number.

It is an amenable number.

121111120022021 is a deficient number, since it is larger than the sum of its proper divisors (4032836463745).

121111120022021 is an equidigital number, since it uses as much as digits as its factorization.

121111120022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126026139523 (or 126026139492 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121111120022021 its reverse (120220021111121), we get a palindrome (241331141133142).

The spelling of 121111120022021 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twenty million, twenty-two thousand, twenty-one".