213154621 has 2 divisors, whose sum is σ = 213154622. Its totient is φ = 213154620.

The previous prime is 213154609. The next prime is 213154631. The reversal of 213154621 is 126451312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212751396 + 403225 = 14586^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 213154621 - 2¹¹ = 213152573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213154631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106577310 + 106577311.

It is an arithmetic number, because the mean of its divisors is an integer number (106577311).

Almost surely, 2^213154621 is an apocalyptic number.

It is an amenable number.

213154621 is a deficient number, since it is larger than the sum of its proper divisors (1).

213154621 is an equidigital number, since it uses as much as digits as its factorization.

213154621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 213154621 is about 14599.8157865091. The cubic root of 213154621 is about 597.3537357827.

The spelling of 213154621 in words is "two hundred thirteen million, one hundred fifty-four thousand, six hundred twenty-one".