216321522 has 16 divisors (see below), whose sum is σ = 438737472. Its totient is φ = 71091440.

The previous prime is 216321487. The next prime is 216321551. The reversal of 216321522 is 225123612.

It is a junction number, because it is equal to n+sod(n) for n = 216321492 and 216321501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253473 + ... + 254324.

It is an arithmetic number, because the mean of its divisors is an integer number (27421092).

Almost surely, 2^216321522 is an apocalyptic number.

216321522 is an abundant number, since it is smaller than the sum of its proper divisors (222415950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216321522 is a wasteful number, since it uses less digits than its factorization.

216321522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507873.

The product of its digits is 1440, while the sum is 24.

The square root of 216321522 is about 14707.8727897681. The cubic root of 216321522 is about 600.2975579633.

The spelling of 216321522 in words is "two hundred sixteen million, three hundred twenty-one thousand, five hundred twenty-two".