211221020221100 has 72 divisors (see below), whose sum is σ = 474329176406400. Its totient is φ = 81545009817600.

The previous prime is 211221020221087. The next prime is 211221020221151. The reversal of 211221020221100 is 1122020122112.

It is a super-2 number, since 2×211221020221100² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5508581 + ... + 21278780.

Almost surely, 2^{211221020221100} is an apocalyptic number.

211221020221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221020221100 is an abundant number, since it is smaller than the sum of its proper divisors (263108156185300).

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

211221020221100 is a wasteful number, since it uses less digits than its factorization.

211221020221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26790123 (or 26790116 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211221020221100 its reverse (1122020122112), we get a palindrome (212343040343212).

The spelling of 211221020221100 in words is "two hundred eleven trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred".