216231322 has 4 divisors (see below), whose sum is σ = 324346986. Its totient is φ = 108115660.

The previous prime is 216231317. The next prime is 216231359. The reversal of 216231322 is 223132612.

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

It can be written as a sum of positive squares in only one way, i.e., 180123241 + 36108081 = 13421^2 + 6009^2 .

It is a super-2 number, since 2×216231322² = 93511969227735368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216231293 and 216231302.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54057829 + ... + 54057832.

Almost surely, 2^216231322 is an apocalyptic number.

216231322 is a deficient number, since it is larger than the sum of its proper divisors (108115664).

216231322 is a wasteful number, since it uses less digits than its factorization.

216231322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108115663.

The product of its digits is 864, while the sum is 22.

The square root of 216231322 is about 14704.8060850866. The cubic root of 216231322 is about 600.2141106224.

Adding to 216231322 its reverse (223132612), we get a palindrome (439363934).

The spelling of 216231322 in words is "two hundred sixteen million, two hundred thirty-one thousand, three hundred twenty-two".