212105512970028 has 72 divisors (see below), whose sum is σ = 537836148145296. Its totient is φ = 70480275465600.

The previous prime is 212105512969997. The next prime is 212105512970041. The reversal of 212105512970028 is 820079215501212.

It is a happy number.

212105512970028 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 0 + 551 + 2 + 9 + 70 + 0 + 28 = 666.

It is a super-2 number, since 2×212105512970028² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104968198 + ... + 106969778.

It is an arithmetic number, because the mean of its divisors is an integer number (7469946502018).

Almost surely, 2^{212105512970028} is an apocalyptic number.

It is an amenable number.

212105512970028 is an abundant number, since it is smaller than the sum of its proper divisors (325730635175268).

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

212105512970028 is a wasteful number, since it uses less digits than its factorization.

212105512970028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010815 (or 2010810 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 212105512970028 in words is "two hundred twelve trillion, one hundred five billion, five hundred twelve million, nine hundred seventy thousand, twenty-eight".