128251662621212 has 24 divisors (see below), whose sum is σ = 241705472235696. Its totient is φ = 59192973237888.

The previous prime is 128251662621211. The next prime is 128251662621227. The reversal of 128251662621212 is 212126266152821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128251662621211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34383248 + ... + 37930344.

It is an arithmetic number, because the mean of its divisors is an integer number (10071061343154).

Almost surely, 2^{128251662621212} is an apocalyptic number.

It is an amenable number.

128251662621212 is a deficient number, since it is larger than the sum of its proper divisors (113453809614484).

128251662621212 is a wasteful number, since it uses less digits than its factorization.

128251662621212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242437 (or 4242435 counting only the distinct ones).

The product of its digits is 552960, while the sum is 47.

The spelling of 128251662621212 in words is "one hundred twenty-eight trillion, two hundred fifty-one billion, six hundred sixty-two million, six hundred twenty-one thousand, two hundred twelve".