210211219978 has 4 divisors (see below), whose sum is σ = 315316829970. Its totient is φ = 105105609988.

The previous prime is 210211219973. The next prime is 210211219991. The reversal of 210211219978 is 879912112012.

It is a happy number.

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., 198820567449 + 11390652529 = 445893^2 + 106727^2 .

It is not an unprimeable number, because it can be changed into a prime (210211219973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52552804993 + ... + 52552804996.

Almost surely, 2^210211219978 is an apocalyptic number.

210211219978 is a deficient number, since it is larger than the sum of its proper divisors (105105609992).

210211219978 is a wasteful number, since it uses less digits than its factorization.

210211219978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105105609991.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 210211219978 in words is "two hundred ten billion, two hundred eleven million, two hundred nineteen thousand, nine hundred seventy-eight".