212052021 has 4 divisors (see below), whose sum is σ = 282736032. Its totient is φ = 141368012.

The previous prime is 212052013. The next prime is 212052053. The reversal of 212052021 is 120250212.

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 212052021 - 2³ = 212052013 is a prime.

It is a super-2 number, since 2×212052021² = 89932119220368882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212050021) 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, 35342001 + ... + 35342006.

It is an arithmetic number, because the mean of its divisors is an integer number (70684008).

Almost surely, 2^212052021 is an apocalyptic number.

It is an amenable number.

212052021 is a deficient number, since it is larger than the sum of its proper divisors (70684011).

212052021 is an equidigital number, since it uses as much as digits as its factorization.

212052021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70684010.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 212052021 is about 14562.0060774606. The cubic root of 212052021 is about 596.3219633705.

The spelling of 212052021 in words is "two hundred twelve million, fifty-two thousand, twenty-one".