209769021000 has 1792 divisors, whose sum is σ = 951680171520. Its totient is φ = 41990400000.

The previous prime is 209769020957. The next prime is 209769021023. The reversal of 209769021000 is 120967902.

209769021000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 2076920950 + ... + 2076921050.

Almost surely, 2^209769021000 is an apocalyptic number.

209769021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209769021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475840085760).

209769021000 is an abundant number, since it is smaller than the sum of its proper divisors (741911150520).

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

209769021000 is a wasteful number, since it uses less digits than its factorization.

209769021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

Adding to 209769021000 its reverse (120967902), we get a palindrome (209889988902).

It can be divided in two parts, 20976902 and 1000, that added together give a palindrome (20977902).

The spelling of 209769021000 in words is "two hundred nine billion, seven hundred sixty-nine million, twenty-one thousand".