216520442 has 8 divisors (see below), whose sum is σ = 330285600. Its totient is φ = 106425244.

The previous prime is 216520441. The next prime is 216520453. The reversal of 216520442 is 244025612.

216520442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×216520442² = 93762203607750728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216520441) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 917342 + ... + 917577.

It is an arithmetic number, because the mean of its divisors is an integer number (41285700).

Almost surely, 2^216520442 is an apocalyptic number.

216520442 is a deficient number, since it is larger than the sum of its proper divisors (113765158).

216520442 is a wasteful number, since it uses less digits than its factorization.

216520442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834980.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 216520442 is about 14714.6336006032. The cubic root of 216520442 is about 600.4815042268.

The spelling of 216520442 in words is "two hundred sixteen million, five hundred twenty thousand, four hundred forty-two".