211220212111 has 8 divisors (see below), whose sum is σ = 222413344880. Its totient is φ = 200034707328.

The previous prime is 211220212067. The next prime is 211220212117. The reversal of 211220212111 is 111212022112.

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

It is a cyclic number.

It is not a de Polignac number, because 211220212111 - 2²¹ = 211218114959 is a prime.

It is a super-2 number, since 2×211220212111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220212117) 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, 1850106 + ... + 1960951.

It is an arithmetic number, because the mean of its divisors is an integer number (27801668110).

Almost surely, 2^211220212111 is an apocalyptic number.

211220212111 is a deficient number, since it is larger than the sum of its proper divisors (11193132769).

211220212111 is a wasteful number, since it uses less digits than its factorization.

211220212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3813993.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211220212111 its reverse (111212022112), we get a palindrome (322432234223).

The spelling of 211220212111 in words is "two hundred eleven billion, two hundred twenty million, two hundred twelve thousand, one hundred eleven".