210122209978 has 4 divisors (see below), whose sum is σ = 315183314970. Its totient is φ = 105061104988.

The previous prime is 210122209967. The next prime is 210122210009. The reversal of 210122209978 is 879902221012.

It is a happy number.

210122209978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 208888303849 + 1233906129 = 457043^2 + 35127^2 .

It is a super-3 number, since 3×210122209978³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52530552493 + ... + 52530552496.

Almost surely, 2^210122209978 is an apocalyptic number.

210122209978 is a deficient number, since it is larger than the sum of its proper divisors (105061104992).

210122209978 is a wasteful number, since it uses less digits than its factorization.

210122209978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105061104991.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 210122209978 in words is "two hundred ten billion, one hundred twenty-two million, two hundred nine thousand, nine hundred seventy-eight".