211721854841 has 32 divisors (see below), whose sum is σ = 252148884480. Its totient is φ = 173992665600.

The previous prime is 211721854831. The next prime is 211721854853. The reversal of 211721854841 is 148458127112.

It is a cyclic number.

It is not a de Polignac number, because 211721854841 - 2²⁶ = 211654745977 is a prime.

It is a super-2 number, since 2×211721854841² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211721854792 and 211721854801.

It is not an unprimeable number, because it can be changed into a prime (211721854811) 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, 10650251 + ... + 10670111.

It is an arithmetic number, because the mean of its divisors is an integer number (7879652640).

Almost surely, 2^211721854841 is an apocalyptic number.

It is an amenable number.

211721854841 is a deficient number, since it is larger than the sum of its proper divisors (40427029639).

211721854841 is a wasteful number, since it uses less digits than its factorization.

211721854841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20505.

The product of its digits is 143360, while the sum is 44.

The spelling of 211721854841 in words is "two hundred eleven billion, seven hundred twenty-one million, eight hundred fifty-four thousand, eight hundred forty-one".