211161111621 has 8 divisors (see below), whose sum is σ = 281611850784. Its totient is φ = 140742223440.

The previous prime is 211161111613. The next prime is 211161111643. The reversal of 211161111621 is 126111161112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211161111621 - 2³ = 211161111613 is a prime.

It is a super-2 number, since 2×211161111621² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211161111591 and 211161111600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211161111121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7947271 + ... + 7973796.

It is an arithmetic number, because the mean of its divisors is an integer number (35201481348).

Almost surely, 2^211161111621 is an apocalyptic number.

It is an amenable number.

211161111621 is a deficient number, since it is larger than the sum of its proper divisors (70450739163).

211161111621 is a wasteful number, since it uses less digits than its factorization.

211161111621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15925491.

The product of its digits is 144, while the sum is 24.

Adding to 211161111621 its reverse (126111161112), we get a palindrome (337272272733).

The spelling of 211161111621 in words is "two hundred eleven billion, one hundred sixty-one million, one hundred eleven thousand, six hundred twenty-one".