121001021129 has 2 divisors, whose sum is σ = 121001021130. Its totient is φ = 121001021128.

The previous prime is 121001021101. The next prime is 121001021173. The reversal of 121001021129 is 921120100121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121001013904 + 7225 = 347852^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001021129 - 2³² = 116706053833 is a prime.

It is a super-2 number, since 2×121001021129² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121001021129.

It is not a weakly prime, because it can be changed into another prime (121001021189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500510564 + 60500510565.

It is an arithmetic number, because the mean of its divisors is an integer number (60500510565).

Almost surely, 2^121001021129 is an apocalyptic number.

It is an amenable number.

121001021129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001021129 is an equidigital number, since it uses as much as digits as its factorization.

121001021129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121001021129 in words is "one hundred twenty-one billion, one million, twenty-one thousand, one hundred twenty-nine".