212032021 has 4 divisors (see below), whose sum is σ = 219343500. Its totient is φ = 204720544.

The previous prime is 212032013. The next prime is 212032061. The reversal of 212032021 is 120230212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36469521 + 175562500 = 6039^2 + 13250^2 .

It is a cyclic number.

It is not a de Polignac number, because 212032021 - 2³ = 212032013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212031992 and 212032010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212032061) 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, 3655696 + ... + 3655753.

It is an arithmetic number, because the mean of its divisors is an integer number (54835875).

Almost surely, 2^212032021 is an apocalyptic number.

It is an amenable number.

212032021 is a deficient number, since it is larger than the sum of its proper divisors (7311479).

212032021 is an equidigital number, since it uses as much as digits as its factorization.

212032021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7311478.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 212032021 is about 14561.3193426969. The cubic root of 212032021 is about 596.3032151184.

Adding to 212032021 its reverse (120230212), we get a palindrome (332262233).

The spelling of 212032021 in words is "two hundred twelve million, thirty-two thousand, twenty-one".