209942122 has 8 divisors (see below), whose sum is σ = 339137316. Its totient is φ = 96896352.

The previous prime is 209942113. The next prime is 209942143. The reversal of 209942122 is 221249902.

209942122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 195188841 + 14753281 = 13971^2 + 3841^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4037323 + ... + 4037374.

Almost surely, 2^209942122 is an apocalyptic number.

209942122 is a deficient number, since it is larger than the sum of its proper divisors (129195194).

209942122 is a wasteful number, since it uses less digits than its factorization.

209942122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8074712.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 209942122 is about 14489.3796278516. The cubic root of 209942122 is about 594.3375835422.

The spelling of 209942122 in words is "two hundred nine million, nine hundred forty-two thousand, one hundred twenty-two".