2121029 has 2 divisors, whose sum is σ = 2121030. Its totient is φ = 2121028.

The previous prime is 2121023. The next prime is 2121043. The reversal of 2121029 is 9201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2024929 + 96100 = 1423^2 + 310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120998 and 2121016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060514 + 1060515.

It is an arithmetic number, because the mean of its divisors is an integer number (1060515).

2^2121029 is an apocalyptic number.

It is an amenable number.

2121029 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121029 is an equidigital number, since it uses as much as digits as its factorization.

2121029 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 17.

The square root of 2121029 is about 1456.3752950390. The cubic root of 2121029 is about 128.4839467801.

The spelling of 2121029 in words is "two million, one hundred twenty-one thousand, twenty-nine".