212021123129 has 4 divisors (see below), whose sum is σ = 214575594576. Its totient is φ = 209466651684.

The previous prime is 212021123087. The next prime is 212021123183. The reversal of 212021123129 is 921321120212.

212021123129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212021123129 - 2¹⁶ = 212021057593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021123098 and 212021123107.

It is not an unprimeable number, because it can be changed into a prime (212021123029) 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 3 ways as a sum of consecutive naturals, for example, 1277235599 + ... + 1277235764.

It is an arithmetic number, because the mean of its divisors is an integer number (53643898644).

Almost surely, 2^212021123129 is an apocalyptic number.

It is an amenable number.

212021123129 is a deficient number, since it is larger than the sum of its proper divisors (2554471447).

212021123129 is an equidigital number, since it uses as much as digits as its factorization.

212021123129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554471446.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 212021123129 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-three thousand, one hundred twenty-nine".