213055421 has 2 divisors, whose sum is σ = 213055422. Its totient is φ = 213055420.

The previous prime is 213055369. The next prime is 213055429. The reversal of 213055421 is 124550312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179935396 + 33120025 = 13414^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 213055421 - 2¹⁰ = 213054397 is a prime.

It is a super-2 number, since 2×213055421² = 90785224834974482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213055429) 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, 106527710 + 106527711.

It is an arithmetic number, because the mean of its divisors is an integer number (106527711).

Almost surely, 2^213055421 is an apocalyptic number.

It is an amenable number.

213055421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213055421 is an equidigital number, since it uses as much as digits as its factorization.

213055421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 213055421 is about 14596.4180880105. The cubic root of 213055421 is about 597.2610539456.

The spelling of 213055421 in words is "two hundred thirteen million, fifty-five thousand, four hundred twenty-one".