209218015028 has 24 divisors (see below), whose sum is σ = 416782134720. Its totient is φ = 90964353920.

The previous prime is 209218015021. The next prime is 209218015033. The reversal of 209218015028 is 820510812902.

It is a junction number, because it is equal to n+sod(n) for n = 209218014982 and 209218015000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209218015021) 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, 103367573 + ... + 103369596.

It is an arithmetic number, because the mean of its divisors is an integer number (17365922280).

Almost surely, 2^209218015028 is an apocalyptic number.

It is an amenable number.

209218015028 is a deficient number, since it is larger than the sum of its proper divisors (207564119692).

209218015028 is a wasteful number, since it uses less digits than its factorization.

209218015028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206737207 (or 206737205 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 209218015028 in words is "two hundred nine billion, two hundred eighteen million, fifteen thousand, twenty-eight".