213633403 has 2 divisors, whose sum is σ = 213633404. Its totient is φ = 213633402.

The previous prime is 213633347. The next prime is 213633419. The reversal of 213633403 is 304336312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213633403 - 2⁹ = 213632891 is a prime.

It is not a weakly prime, because it can be changed into another prime (213633463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106816701 + 106816702.

It is an arithmetic number, because the mean of its divisors is an integer number (106816702).

Almost surely, 2^213633403 is an apocalyptic number.

213633403 is a deficient number, since it is larger than the sum of its proper divisors (1).

213633403 is an equidigital number, since it uses as much as digits as its factorization.

213633403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 25.

The square root of 213633403 is about 14616.2034400182. The cubic root of 213633403 is about 597.8006544640.

Adding to 213633403 its reverse (304336312), we get a palindrome (517969715).

It can be divided in two parts, 213 and 633403, that added together give a square (633616 = 796²).

The spelling of 213633403 in words is "two hundred thirteen million, six hundred thirty-three thousand, four hundred three".