216922455 has 24 divisors (see below), whose sum is σ = 389926992. Its totient is φ = 115691328.

The previous prime is 216922441. The next prime is 216922471. The reversal of 216922455 is 554229612.

It is not a de Polignac number, because 216922455 - 2⁵ = 216922423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88054 + ... + 90483.

It is an arithmetic number, because the mean of its divisors is an integer number (16246958).

Almost surely, 2^216922455 is an apocalyptic number.

216922455 is a deficient number, since it is larger than the sum of its proper divisors (173004537).

216922455 is an equidigital number, since it uses as much as digits as its factorization.

216922455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178557 (or 178545 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 216922455 is about 14728.2875786698. The cubic root of 216922455 is about 600.8529119941.

The spelling of 216922455 in words is "two hundred sixteen million, nine hundred twenty-two thousand, four hundred fifty-five".