211861135740 has 72 divisors (see below), whose sum is σ = 599391403632. Its totient is φ = 55913717760.

The previous prime is 211861135723. The next prime is 211861135807. The reversal of 211861135740 is 47531168112.

211861135740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 376900 + ... + 752180.

It is an arithmetic number, because the mean of its divisors is an integer number (8324880606).

Almost surely, 2^211861135740 is an apocalyptic number.

211861135740 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 211861135740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299695701816).

211861135740 is an abundant number, since it is smaller than the sum of its proper divisors (387530267892).

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

211861135740 is a wasteful number, since it uses less digits than its factorization.

211861135740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375487 (or 375388 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 211861135740 in words is "two hundred eleven billion, eight hundred sixty-one million, one hundred thirty-five thousand, seven hundred forty".