213220455 has 64 divisors (see below), whose sum is σ = 406591488. Its totient is φ = 93381120.

The previous prime is 213220433. The next prime is 213220457. The reversal of 213220455 is 554022312.

It is not a de Polignac number, because 213220455 - 2⁶ = 213220391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220457) 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 in 63 ways as a sum of consecutive naturals, for example, 275449 + ... + 276221.

It is an arithmetic number, because the mean of its divisors is an integer number (6352992).

Almost surely, 2^213220455 is an apocalyptic number.

213220455 is a deficient number, since it is larger than the sum of its proper divisors (193371033).

213220455 is a wasteful number, since it uses less digits than its factorization.

213220455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 213220455 is about 14602.0702299366. The cubic root of 213220455 is about 597.4152281360.

Adding to 213220455 its reverse (554022312), we get a palindrome (767242767).

The spelling of 213220455 in words is "two hundred thirteen million, two hundred twenty thousand, four hundred fifty-five".