211209272080 has 80 divisors (see below), whose sum is σ = 500560712064. Its totient is φ = 82861793280.

The previous prime is 211209272077. The next prime is 211209272081. The reversal of 211209272080 is 80272902112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×211209272080² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211209272081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999907 + ... + 1192573.

Almost surely, 2^211209272080 is an apocalyptic number.

211209272080 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 211209272080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250280356032).

211209272080 is an abundant number, since it is smaller than the sum of its proper divisors (289351439984).

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

211209272080 is a wasteful number, since it uses less digits than its factorization.

211209272080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192944 (or 192938 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 211209272080 in words is "two hundred eleven billion, two hundred nine million, two hundred seventy-two thousand, eighty".