211221020111 has 8 divisors (see below), whose sum is σ = 213168942000. Its totient is φ = 209280169600.

The previous prime is 211221020089. The next prime is 211221020119. The reversal of 211221020111 is 111020122112.

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 211221020111 - 2¹⁸ = 211220757967 is a prime.

It is a super-2 number, since 2×211221020111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221020119) 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, 1707821 + ... + 1827318.

It is an arithmetic number, because the mean of its divisors is an integer number (26646117750).

Almost surely, 2^211221020111 is an apocalyptic number.

211221020111 is a deficient number, since it is larger than the sum of its proper divisors (1947921889).

211221020111 is a wasteful number, since it uses less digits than its factorization.

211221020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535689.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211221020111 its reverse (111020122112), we get a palindrome (322241142223).

The spelling of 211221020111 in words is "two hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred eleven".