213112209978 has 80 divisors (see below), whose sum is σ = 479070789120. Its totient is φ = 70808481504.

The previous prime is 213112209977. The next prime is 213112209991. The reversal of 213112209978 is 879902211312.

213112209978 is a `hidden beast` number, since 21 + 311 + 220 + 9 + 97 + 8 = 666.

213112209978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (213112209971) by changing a digit.

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 in 39 ways as a sum of consecutive naturals, for example, 127687728 + ... + 127689396.

It is an arithmetic number, because the mean of its divisors is an integer number (5988384864).

Almost surely, 2^213112209978 is an apocalyptic number.

213112209978 is an abundant number, since it is smaller than the sum of its proper divisors (265958579142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213112209978 is a wasteful number, since it uses less digits than its factorization.

213112209978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 3744 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 213112209978 in words is "two hundred thirteen billion, one hundred twelve million, two hundred nine thousand, nine hundred seventy-eight".