212123111985738 has 24 divisors (see below), whose sum is σ = 474425884872576. Its totient is φ = 68426810317800.

The previous prime is 212123111985689. The next prime is 212123111985739. The reversal of 212123111985738 is 837589111321212.

212123111985738 is a `hidden beast` number, since 2 + 1 + 21 + 2 + 31 + 1 + 19 + 8 + 573 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (212123111985739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190074472548 + ... + 190074473663.

It is an arithmetic number, because the mean of its divisors is an integer number (19767745203024).

Almost surely, 2^{212123111985738} is an apocalyptic number.

212123111985738 is an abundant number, since it is smaller than the sum of its proper divisors (262302772886838).

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

212123111985738 is a wasteful number, since it uses less digits than its factorization.

212123111985738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380148946250 (or 380148946247 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 212123111985738 in words is "two hundred twelve trillion, one hundred twenty-three billion, one hundred eleven million, nine hundred eighty-five thousand, seven hundred thirty-eight".