2021210212129 has 2 divisors, whose sum is σ = 2021210212130. Its totient is φ = 2021210212128.

The previous prime is 2021210212121. The next prime is 2021210212291. The reversal of 2021210212129 is 9212120121202.

It is a happy number.

Together with next prime (2021210212291) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1966229341729 + 54980870400 = 1402223^2 + 234480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021210212129 - 2³ = 2021210212121 is a prime.

It is a super-2 number, since 2×2021210212129² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021210212121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010605106064 + 1010605106065.

It is an arithmetic number, because the mean of its divisors is an integer number (1010605106065).

Almost surely, 2^{2021210212129} is an apocalyptic number.

It is an amenable number.

2021210212129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021210212129 is an equidigital number, since it uses as much as digits as its factorization.

2021210212129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 2021210212129 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-nine".