216997442 has 16 divisors (see below), whose sum is σ = 347457600. Its totient is φ = 101339280.

The previous prime is 216997411. The next prime is 216997453. The reversal of 216997442 is 244799612.

It is a junction number, because it is equal to n+sod(n) for n = 216997393 and 216997402.

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, 37517 + ... + 42912.

It is an arithmetic number, because the mean of its divisors is an integer number (21716100).

Almost surely, 2^216997442 is an apocalyptic number.

216997442 is a deficient number, since it is larger than the sum of its proper divisors (130460158).

216997442 is a wasteful number, since it uses less digits than its factorization.

216997442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80521.

The product of its digits is 217728, while the sum is 44.

The square root of 216997442 is about 14730.8330382229. The cubic root of 216997442 is about 600.9221394461.

The spelling of 216997442 in words is "two hundred sixteen million, nine hundred ninety-seven thousand, four hundred forty-two".