211221210221110 has 192 divisors, whose sum is σ = 413943800789376. Its totient is φ = 77324475432960.

The previous prime is 211221210221107. The next prime is 211221210221141. The reversal of 211221210221110 is 11122012122112.

It is a happy number.

It is a super-2 number, since 2×211221210221110² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43849117422 + ... + 43849122238.

It is an arithmetic number, because the mean of its divisors is an integer number (2155957295778).

Almost surely, 2^{211221210221110} is an apocalyptic number.

211221210221110 is a deficient number, since it is larger than the sum of its proper divisors (202722590568266).

211221210221110 is a wasteful number, since it uses less digits than its factorization.

211221210221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739 (or 5678 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221210221110 its reverse (11122012122112), we get a palindrome (222343222343222).

The spelling of 211221210221110 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred ten".