211221211122200 has 48 divisors (see below), whose sum is σ = 491100850365000. Its totient is φ = 84486500017920.

The previous prime is 211221211122191. The next prime is 211221211122221. The reversal of 211221211122200 is 2221112122112.

It is a super-2 number, since 2×211221211122200² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3851570 + ... + 20911169.

Almost surely, 2^{211221211122200} is an apocalyptic number.

211221211122200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221211122200 is an abundant number, since it is smaller than the sum of its proper divisors (279879639242800).

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

211221211122200 is a wasteful number, since it uses less digits than its factorization.

211221211122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24805404 (or 24805395 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221211122200 its reverse (2221112122112), we get a palindrome (213442323244312).

The spelling of 211221211122200 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred".