211111221000 has 64 divisors (see below), whose sum is σ = 658667018880. Its totient is φ = 56296324800.

The previous prime is 211111220981. The next prime is 211111221001. The reversal of 211111221000 is 122111112.

It is a super-2 number, since 2×211111221000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (211111221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35182204 + ... + 35188203.

It is an arithmetic number, because the mean of its divisors is an integer number (10291672170).

Almost surely, 2^211111221000 is an apocalyptic number.

211111221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111221000 is an abundant number, since it is smaller than the sum of its proper divisors (447555797880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211111221000 is a wasteful number, since it uses less digits than its factorization.

211111221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70370431 (or 70370417 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211111221000 its reverse (122111112), we get a palindrome (211233332112).

The spelling of 211111221000 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand".