210868642 has 4 divisors (see below), whose sum is σ = 316302966. Its totient is φ = 105434320.

The previous prime is 210868639. The next prime is 210868681. The reversal of 210868642 is 246868012.

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., 202464441 + 8404201 = 14229^2 + 2899^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52717159 + ... + 52717162.

Almost surely, 2^210868642 is an apocalyptic number.

210868642 is a deficient number, since it is larger than the sum of its proper divisors (105434324).

210868642 is a wasteful number, since it uses less digits than its factorization.

210868642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105434323.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 210868642 is about 14521.3168135676. The cubic root of 210868642 is about 595.2106139502.

The spelling of 210868642 in words is "two hundred ten million, eight hundred sixty-eight thousand, six hundred forty-two".