212021119978 has 4 divisors (see below), whose sum is σ = 318031679970. Its totient is φ = 106010559988.

The previous prime is 212021119967. The next prime is 212021119997. The reversal of 212021119978 is 879911120212.

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., 186681892489 + 25339227489 = 432067^2 + 159183^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53005279993 + ... + 53005279996.

Almost surely, 2^212021119978 is an apocalyptic number.

212021119978 is a deficient number, since it is larger than the sum of its proper divisors (106010559992).

212021119978 is a wasteful number, since it uses less digits than its factorization.

212021119978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106010559991.

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

The spelling of 212021119978 in words is "two hundred twelve billion, twenty-one million, one hundred nineteen thousand, nine hundred seventy-eight".