128101212 has 36 divisors (see below), whose sum is σ = 329925960. Its totient is φ = 41894112.

The previous prime is 128101199. The next prime is 128101223. The reversal of 128101212 is 212101821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31662 + ... + 35477.

It is an arithmetic number, because the mean of its divisors is an integer number (9164610).

Almost surely, 2^128101212 is an apocalyptic number.

128101212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128101212 is an abundant number, since it is smaller than the sum of its proper divisors (201824748).

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

128101212 is a wasteful number, since it uses less digits than its factorization.

128101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67202 (or 67197 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 128101212 is about 11318.1805958378. The cubic root of 128101212 is about 504.1012173886.

The spelling of 128101212 in words is "one hundred twenty-eight million, one hundred one thousand, two hundred twelve".