211161571720 has 64 divisors (see below), whose sum is σ = 520530416640. Its totient is φ = 76456435200.

The previous prime is 211161571711. The next prime is 211161571721. The reversal of 211161571720 is 27175161112.

211161571720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (211161571721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927336 + ... + 1132375.

It is an arithmetic number, because the mean of its divisors is an integer number (8133287760).

Almost surely, 2^211161571720 is an apocalyptic number.

211161571720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211161571720 is an abundant number, since it is smaller than the sum of its proper divisors (309368844920).

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

211161571720 is a wasteful number, since it uses less digits than its factorization.

211161571720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059966 (or 2059962 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 34.

The spelling of 211161571720 in words is "two hundred eleven billion, one hundred sixty-one million, five hundred seventy-one thousand, seven hundred twenty".