211994864041 has 9 divisors (see below), whose sum is σ = 212905331613. Its totient is φ = 211088279340.

The previous prime is 211994864033. The next prime is 211994864089. The reversal of 211994864041 is 140468499112.

The square root of 211994864041 is 460429.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 211994864041 - 2³ = 211994864033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211994864021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 124775410 + ... + 124777108.

It is an arithmetic number, because the mean of its divisors is an integer number (23656147957).

Almost surely, 2^211994864041 is an apocalyptic number.

211994864041 is the 460429-th square number.

211994864041 is the 230215-th centered octagonal number.

It is an amenable number.

211994864041 is a deficient number, since it is larger than the sum of its proper divisors (910467572).

211994864041 is an frugal number, since it uses more digits than its factorization.

211994864041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

Multiplying 211994864041 by its sum of digits (49), we get a square (10387748338009 = 3223003²).

The spelling of 211994864041 in words is "two hundred eleven billion, nine hundred ninety-four million, eight hundred sixty-four thousand, forty-one".