211161005020 has 96 divisors (see below), whose sum is σ = 520196455296. Its totient is φ = 70505856000.

The previous prime is 211161004981. The next prime is 211161005023. The reversal of 211161005020 is 20500161112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211161005023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740134 + ... + 984946.

It is an arithmetic number, because the mean of its divisors is an integer number (5418713076).

Almost surely, 2^211161005020 is an apocalyptic number.

211161005020 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 211161005020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260098227648).

211161005020 is an abundant number, since it is smaller than the sum of its proper divisors (309035450276).

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

211161005020 is a wasteful number, since it uses less digits than its factorization.

211161005020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244991 (or 244989 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 211161005020 its reverse (20500161112), we get a palindrome (231661166132).

The spelling of 211161005020 in words is "two hundred eleven billion, one hundred sixty-one million, five thousand, twenty".