212102022021 has 4 divisors (see below), whose sum is σ = 282802696032. Its totient is φ = 141401348012.

The previous prime is 212102021981. The next prime is 212102022101. The reversal of 212102022021 is 120220201212.

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 212102022021 - 2²³ = 212093633413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102022521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35350337001 + ... + 35350337006.

It is an arithmetic number, because the mean of its divisors is an integer number (70700674008).

Almost surely, 2^212102022021 is an apocalyptic number.

It is an amenable number.

212102022021 is a deficient number, since it is larger than the sum of its proper divisors (70700674011).

212102022021 is an equidigital number, since it uses as much as digits as its factorization.

212102022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70700674010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212102022021 its reverse (120220201212), we get a palindrome (332322223233).

It can be divided in two parts, 21210 and 2022021, that added together give a triangular number (2043231 = T₂₀₂₁).

The spelling of 212102022021 in words is "two hundred twelve billion, one hundred two million, twenty-two thousand, twenty-one".