202012219978 has 4 divisors (see below), whose sum is σ = 303018329970. Its totient is φ = 101006109988.

The previous prime is 202012219949. The next prime is 202012219979. The reversal of 202012219978 is 879912210202.

It is a happy number.

202012219978 is digitally balanced in base 3, 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., 138274653609 + 63737566369 = 371853^2 + 252463^2 .

It is not an unprimeable number, because it can be changed into a prime (202012219979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50503054993 + ... + 50503054996.

Almost surely, 2^202012219978 is an apocalyptic number.

202012219978 is a deficient number, since it is larger than the sum of its proper divisors (101006109992).

202012219978 is a wasteful number, since it uses less digits than its factorization.

202012219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101006109991.

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

The spelling of 202012219978 in words is "two hundred two billion, twelve million, two hundred nineteen thousand, nine hundred seventy-eight".