201213421 has 2 divisors, whose sum is σ = 201213422. Its totient is φ = 201213420.

The previous prime is 201213373. The next prime is 201213427. The reversal of 201213421 is 124312102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132572196 + 68641225 = 11514^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 201213421 - 2⁷ = 201213293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201213395 and 201213404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201213427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100606710 + 100606711.

It is an arithmetic number, because the mean of its divisors is an integer number (100606711).

Almost surely, 2^201213421 is an apocalyptic number.

It is an amenable number.

201213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

201213421 is an equidigital number, since it uses as much as digits as its factorization.

201213421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 201213421 is about 14184.9716601761. The cubic root of 201213421 is about 585.9838520169.

Adding to 201213421 its reverse (124312102), we get a palindrome (325525523).

The spelling of 201213421 in words is "two hundred one million, two hundred thirteen thousand, four hundred twenty-one".