215420455 has 4 divisors (see below), whose sum is σ = 258504552. Its totient is φ = 172336360.

The previous prime is 215420431. The next prime is 215420467. The reversal of 215420455 is 554024512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 215420455 - 2²¹ = 213323303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21542041 + ... + 21542050.

It is an arithmetic number, because the mean of its divisors is an integer number (64626138).

Almost surely, 2^215420455 is an apocalyptic number.

215420455 is a deficient number, since it is larger than the sum of its proper divisors (43084097).

215420455 is an equidigital number, since it uses as much as digits as its factorization.

215420455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43084096.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 215420455 is about 14677.2086923911. The cubic root of 215420455 is about 599.4629036152.

Adding to 215420455 its reverse (554024512), we get a palindrome (769444967).

The spelling of 215420455 in words is "two hundred fifteen million, four hundred twenty thousand, four hundred fifty-five".