209120020002 has 28 divisors (see below), whose sum is σ = 470304904230. Its totient is φ = 69706672848.

The previous prime is 209120020001. The next prime is 209120020099. The reversal of 209120020002 is 200020021902.

It can be written as a sum of positive squares in only one way, i.e., 204945438681 + 4174581321 = 452709^2 + 64611^2 .

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

It is not an unprimeable number, because it can be changed into a prime (209120020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 71713227 + ... + 71716142.

Almost surely, 2^209120020002 is an apocalyptic number.

209120020002 is an abundant number, since it is smaller than the sum of its proper divisors (261184884228).

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

209120020002 is an equidigital number, since it uses as much as digits as its factorization.

209120020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143429389 (or 143429374 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 209120020002 its reverse (200020021902), we get a palindrome (409140041904).

The spelling of 209120020002 in words is "two hundred nine billion, one hundred twenty million, twenty thousand, two".