213422551 has 2 divisors, whose sum is σ = 213422552. Its totient is φ = 213422550.

The previous prime is 213422533. The next prime is 213422563. The reversal of 213422551 is 155224312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213422551 - 2⁵ = 213422519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213422501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106711275 + 106711276.

It is an arithmetic number, because the mean of its divisors is an integer number (106711276).

Almost surely, 2^213422551 is an apocalyptic number.

213422551 is a deficient number, since it is larger than the sum of its proper divisors (1).

213422551 is an equidigital number, since it uses as much as digits as its factorization.

213422551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 213422551 is about 14608.9887055881. The cubic root of 213422551 is about 597.6039171976.

Adding to 213422551 its reverse (155224312), we get a palindrome (368646863).

The spelling of 213422551 in words is "two hundred thirteen million, four hundred twenty-two thousand, five hundred fifty-one".