212021031121 has 4 divisors (see below), whose sum is σ = 212071289200. Its totient is φ = 211970773044.

The previous prime is 212021031037. The next prime is 212021031181. The reversal of 212021031121 is 121130120212.

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 212021031121 - 2¹⁹ = 212020506833 is a prime.

It is a super-2 number, since 2×212021031121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021031095 and 212021031104.

It is not an unprimeable number, because it can be changed into a prime (212021031181) 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 in 3 ways as a sum of consecutive naturals, for example, 25122711 + ... + 25131148.

It is an arithmetic number, because the mean of its divisors is an integer number (53017822300).

Almost surely, 2^212021031121 is an apocalyptic number.

It is an amenable number.

212021031121 is a deficient number, since it is larger than the sum of its proper divisors (50258079).

212021031121 is an equidigital number, since it uses as much as digits as its factorization.

212021031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50258078.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212021031121 its reverse (121130120212), we get a palindrome (333151151333).

The spelling of 212021031121 in words is "two hundred twelve billion, twenty-one million, thirty-one thousand, one hundred twenty-one".