213412021 has 2 divisors, whose sum is σ = 213412022. Its totient is φ = 213412020.

The previous prime is 213412019. The next prime is 213412039. The reversal of 213412021 is 120214312.

213412021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163200625 + 50211396 = 12775^2 + 7086^2 .

It is a cyclic number.

It is not a de Polignac number, because 213412021 - 2¹ = 213412019 is a prime.

Together with 213412019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213411986 and 213412004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213412051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106706010 + 106706011.

It is an arithmetic number, because the mean of its divisors is an integer number (106706011).

Almost surely, 2^213412021 is an apocalyptic number.

It is an amenable number.

213412021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213412021 is an equidigital number, since it uses as much as digits as its factorization.

213412021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 213412021 is about 14608.6283065865. The cubic root of 213412021 is about 597.5940886943.

Adding to 213412021 its reverse (120214312), we get a palindrome (333626333).

The spelling of 213412021 in words is "two hundred thirteen million, four hundred twelve thousand, twenty-one".