212287798009 has 15 divisors (see below), whose sum is σ = 247680702213. Its totient is φ = 181941618348.

The previous prime is 212287797913. The next prime is 212287798031. The reversal of 212287798009 is 900897782212.

The square root of 212287798009 is 460747.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 212287798009 - 2²¹ = 212285700857 is a prime.

It is a super-2 number, since 2×212287798009² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212287795009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 22571902 + ... + 22581304.

Almost surely, 2^212287798009 is an apocalyptic number.

212287798009 is the 460747-th square number.

212287798009 is the 230374-th centered octagonal number.

It is an amenable number.

212287798009 is a deficient number, since it is larger than the sum of its proper divisors (35392904204).

212287798009 is an frugal number, since it uses more digits than its factorization.

212287798009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18834 (or 9410 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 212287798009 in words is "two hundred twelve billion, two hundred eighty-seven million, seven hundred ninety-eight thousand, nine".