212506901128 has 8 divisors (see below), whose sum is σ = 398450439630. Its totient is φ = 106253450560.

The previous prime is 212506901081. The next prime is 212506901129. The reversal of 212506901128 is 821109605212.

It can be written as a sum of positive squares in only one way, i.e., 149705538724 + 62801362404 = 386918^2 + 250602^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (212506901129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13281681313 + ... + 13281681328.

Almost surely, 2^212506901128 is an apocalyptic number.

It is an amenable number.

212506901128 is a deficient number, since it is larger than the sum of its proper divisors (185943538502).

212506901128 is a wasteful number, since it uses less digits than its factorization.

212506901128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26563362647 (or 26563362643 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 212506901128 in words is "two hundred twelve billion, five hundred six million, nine hundred one thousand, one hundred twenty-eight".